PHYSIOMETRIX INC
S-8, 1996-11-21
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>

       AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 21, 1996
                                                    REGISTRATION NO. 333-       
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                           --------------------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                           --------------------------

                               PHYSIOMETRIX, INC.
               (Exact name of issuer as specified in its charter)
                           --------------------------

          Delaware                                   77-0248588
        ------------                                 ----------
  (State of incorporation)              (I.R.S. Employer Identification No.)

                               FIVE BILLERICA PARK
                              101 BILLERICA AVENUE
                         NORTH BILLERICA, MA  01862-1256
                    (address of principal executive offices)
                           --------------------------

                                 1991 STOCK PLAN
                            1996 DIRECTOR OPTION PLAN
                        1996 EMPLOYEE STOCK PURCHASE PLAN

                           (Full titles of the plans)
                           --------------------------

                                JOHN A. WILLIAMS
                     CHIEF EXECUTIVE OFFICER AND PRESIDENT 
                               PHYSIOMETRIX, INC.
                               FIVE BILLERICA PARK
                              101 BILLERICA AVENUE
                         NORTH BILLERICA, MA  01862-1256
                                 (508) 670-2422
(Name, address, and telephone number, including area code, of agent for service)
                           --------------------------

                                    Copy to:
                           CHRISTOPHER MITCHELL, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                            PALO ALTO, CA 94304-1050
                                 (415) 493-9300


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- --------------------------------------------------------------------------------

<PAGE>

<TABLE>
<CAPTION>

                                                   CALCULATION OF REGISTRATION FEE

- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
                                                                         PROPOSED          PROPOSED
                TITLE OF                       MAXIMUM                    MAXIMUM           MAXIMUM
               SECURITIES                      AMOUNT                    OFFERING          AGGREGATE              AMOUNT OF
                 TO BE                          TO BE                    PRICE PER         OFFERING             REGISTRATION
             REGISTERED (1)                  REGISTERED                    SHARE             PRICE                   FEE
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                       <C>             <C>                      <C>     
1991 INCENTIVE STOCK PLAN
Common Stock,
  $.001 par value, shares outstanding          817,428 shares (2)      $ 6.25           $  564,025 (3)          $    194.49
  $.001 par value, shares available            348,972 shares (4)      $ 4.00           $1,395,888 (5)          $    481.34
1996 DIRECTOR OPTION PLAN
Common Stock,
  $.001 par value, shares outstanding           15,000 shares (2)      $ 5.38           $   80,700              $     27.83
  $.001 par value, shares available            135,000 shares (4)      $ 4.00           $  540,000 (5)          $    186.21
1996 EMPLOYEE STOCK PURCHASE PLAN
Common Stock,                                                    
  $.001 par value                              150,000 shares (6)      $ 4.00           $  600,000 (7)          $    206.90
Total                                            1,466,400 shares                       $3,180,613              $   1096.77
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------

- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1)  In addition, pursuant to Rule 416(c) under the Securities Act of 1933 ( the
     "Securities Act"), this Registration Statement covers an indeterminate 
     amount of interests to be offered or sold pursuant to the employee 
     benefit plans described herein. 

(2)  For the sole purpose of calculating the registration fee, the number of
     shares to be registered under this Registration Statement has been broken
     down into five subtotals.  This subtotal represents the number of shares
     issuable upon exercise of currently outstanding options (options that have
     been granted as of the date of this Registration Statement).

(3)  Calculated in accordance with Rule 457(h) under the Securities Act based on
     the weighted average exercise price per share of $0.69 as to 817,428
     outstanding but unexercised options to purchase Common Stock.

(4)  This subtotal represents the number of shares issuable upon exercise of
     options that are available for grant, but have not been granted.

(5)  Calculated in accordance with Rule 457(h) under the Securities Act solely
     for the purpose of calculating the registration fee. The computation is
     based upon the average of the high and low prices of the Common Stock as
     reported on the Nasdaq National Market on November 13, 1996 because the
     price at which options to be granted in the future may be exercised is not
     currently determinable.

(6)  This subtotal represents the number of shares authorized to be issued under
     the 1996 Employee Stock Purchase Plan.

(7)  Estimated in accordance with Rule 457(h) under the Securities Act solely
     for the purpose of calculating the total registration fee.  Calculation
     based upon 85% (see explanation in following sentence) of the closing price
     of the Common Stock as reported on the Nasdaq National Market on  November
     13, 1996 because the price at which the shares will be sold in the future
     is not currently determinable.  The purchase price of a share of Common 
     Stock pursuant to the 1996 Employee Stock Purchase Plan, which plan is
     incorporated by reference herein, is equal to 85% of the Fair Market Value
     of a share of Common Stock on either the first day of the applicable
     offering period or the last day of the applicable purchase period,
     whichever is lower.  


                                       ii

<PAGE>

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

     There are hereby incorporated by reference in this Registration Statement
the following documents and information heretofore filed by Physiometrix, Inc.
(the "Company") with the Securities and Exchange Commission:

(a)  The audited financial statements for the Registrant's fiscal year ended
     December 31, 1995 contained in the Registration Statement on Form S-1 
     (No. 333-2138) filed pursuant to Rule 424(b)(4) under the Securities Act
     of 1933, as amended (the "Securities Act"), on April 30, 1996.

(b)  The Registrant's Quarterly Reports on Form 10-Q for the quarters ended 
     March 31, 1996, June 30, 1996 and September 30, 1996, filed pursuant to
     Section 13 of the Securities Exchange Act of 1934, as amended (the
     "Exchange Act"), on May 15, 1996, August 13, 1996 and November 14, 1996,
     respectively.

(c)  The description of the Common Stock of the Registrant that is contained in
     the Registration Statement on Form S-1 (No. 333-2138) filed pursuant to
     Rule 424(b)(4) under the Securities Act.

(d)  All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14
     and 15(d) of the Exchange Act subsequent to the filing of this Registration
     Statement and prior to the filing of a post-effective amendment which
     indicates that all securities offered have been sold or which deregisters
     all securities then remaining unsold, shall be deemed to be incorporated by
     reference in the Registration Statement and to be part hereof from the date
     of filing of such documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

     Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

     Certain members of Wilson Sonsini Goodrich and Rosati, Professional
Corporation, and investment partnerships of which such persons are partners
beneficially own 11,788 shares of the Registrant's Common Stock.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Section 145(a) of the Delaware General Corporation Law (the "DGCL")
provides in relevant part that "a corporation shall have power to indemnify any
person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative (other than an action by or in the
right of the corporation) by reason of the fact that he is or was a director,
officer, employee or agent of the corporation, or is or was serving at the
request of the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise, against
expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful."  With respect to
derivative actions, Section 145(b) of the DGCL provides in relevant part that
"[a] corporation may indemnify any person who was or is a party or is threatened
to be made a party to any threatened, pending or completed action or suit by or
in the right of the corporation to procure a judgment in its favor by reason of
the fact that he is or was a director, officer, employee or 

<PAGE>

agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise against expenses (including attorneys'
fees) actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper."

     The Company's Certificate of Incorporation provides that to the fullest
extent permitted by the DGCL, no director of the Company shall be personally
liable to the Company or its stockholders for monetary damages for breach of
fiduciary duty as a director.  The Certificate of Incorporation also provides
that no amendment or repeal of such provision shall apply to or have any effect
on the right to indemnification permitted thereunder with respect to claims
arising from acts or omissions occurring in whole or in part before the
effective date of such amendment or repeal whether asserted before or after such
amendment or repeal.

     The Company's Bylaws provide that the Company shall indemnify to the
fullest extent permitted by law each of its directors and executive officers and
may indemnify to the fullest extent permitted by law each of its other officers,
employees and other agents, against expenses actually and reasonably incurred in
connection with any proceeding arising by reason of the fact that such person is
or was an agent of the corporation.

     The Company has entered into indemnification agreements with its directors
and executive officers, in addition to indemnification provided for in the
Company's Bylaws, and intends to enter into indemnification agreements with any
new directors and executive officers in the future.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.
           
          Not applicable.               
                                        
ITEM 8.  EXHIBITS.  


Exhibit
Number                              Document
- ------  ----------------------------------------------------------------

4.1     1991 Stock Plan.

4.2     1996 Director Option Plan.

4.3     1996 Employee Stock Purchase Plan.

5.1     Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation,
        as to the legality of securities being registered.

23.1    Consent of Ernst & Young LLP, independent auditors.

23.2    Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
        (contained in Exhibit 5.1 hereto).

24.1    Power of Attorney (see page II-4).
        

                                      II-2

<PAGE>

ITEM 9.  UNDERTAKINGS.

         A.    The Company hereby undertakes:

               (1)  To file, during any period in which offers or sales are
being made, a post-effective amendment to this registration statement to include
any material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such
information in the registration statement.

               (2)  That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

               (3)  To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

          B.   The undersigned registrant hereby undertakes that, for purposes
of determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          C.   Insofar as indemnification for liabilities arising under the 
Securities Act may be permitted to directors, officers and controlling 
persons of the Company pursuant to the DGCL, the Company's Certificate of 
Incorporation, the Company's Bylaws or the Company's indemnification 
agreements, or otherwise, the Company has been informed that in the opinion 
of the Securities and Exchange Commission such indemnification is against 
public policy as expressed in the Securities Act and is, therefore, 
unenforceable.  In the event that a claim for indemnification against such 
liabilities (other than the payment by the Company of expenses incurred or 
paid by a director, officer or controlling person of the Company in a 
successful defense of any action, suit or proceeding) is asserted by such 
director, officer or controlling person in connection with the securities 
being registered hereunder, the Company will, unless in the opinion of its 
counsel the matter has been settled by controlling precedent, submit to a 
court of appropriate jurisdiction the question whether such indemnification 
by it is against public policy as expressed in the Securities Act and will be 
governed by the final adjudication of such issue.

                                      II-3

<PAGE>

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of North Billerica, State of Massachusetts, on November
21, 1996.

                                   PHYSIOMETRIX, INC.

                                   By:  /s/ JOHN A. WILLIAMS               
                                       ------------------------------------
                                            John A. Williams, President and
                                            Chief Executive Officer

                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints John A. Williams and Michael J. Tubridy,
jointly and severally, as his or her attorneys-in-fact, with full power of
substitution in each, for him or her in any and all capacities to sign any
amendments to this Registration Statement on Form S-8, and to file the same,
with exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, hereby ratifying and confirming all that
each of said attorneys-in-fact, or his substitutes, may do or cause to be done
by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and on the dates indicated.


      Signature                         Title                        Date
- -----------------------    ----------------------------------  -----------------

/s/ JOHN A. WILLIAMS       President, Chief Executive Officer  November 21, 1996
- -----------------------    and Director (Principal Executive   
(John A. Williams)         Officer)

/s/ MICHAEL J. TUBRIDY     Vice President of Finance &         November 21, 1996
- -----------------------    Administration and Chief Financial  
(Michael J. Tubridy)       Officer (Principal Financial and
                           Accounting Officer)

/s/ THOMAS BARUCH          Chairman of the Board of Directors  November 21, 1996
- -----------------------
(Thomas Baruch)            

/s/ JAMES SAALFIELD        Director                            November 21, 1996
- -----------------------
(James Saalfield)          

                           Director        
- -----------------------
(Mir A. Imran)             

                           Director    
- -----------------------
(Thomas J. Toy)            

/s/ HAROLD C. HOHBACH      Director                            November 21, 1996
- -----------------------
(Harold C. Hohbach)        

/s/ ANNETTE CAMPBELL-WHITE Director                            November 21, 1996
- --------------------------
(Annette Campbell-White)   


                                      II-4

<PAGE>

                         SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C.  20549

          ------------------------------------------------------------

                                    EXHIBITS

          ------------------------------------------------------------

                       Registration Statement on Form S-8

                               PHYSIOMETRIX, INC.

                                        

<PAGE>

                                INDEX TO EXHIBITS



  Exhibit
  Number                            Document
- ----------  ------------------------------------------------------------


    4.1     1991 Stock Plan.

    4.2     1996 Director Option Plan.

    4.3     1996 Employee Stock Purchase Plan.

    5.1     Opinion of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation, as to the legality of securities being registered.

   23.1     Consent of Ernst & Young LLP, independent auditors.

   23.2     Consent of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation (contained in Exhibit 5.1 hereto).

   24.1     Power of Attorney (see page II-4).
 

<PAGE>
                               PHYSIOMETRIX, INC.

                                 1991 STOCK PLAN

1.   PURPOSES OF THE PLAN.  The purposes of this Stock Plan are to attract and
retain the best available personnel for positions of substantial responsibility,
to provide additional incentive to Employees and Consultants of the Company and
its Subsidiaries and to promote the success of the Company's business.  Options
granted under the Plan may be incentive stock options (as defined under Section
422 of the Code) or non-statutory stock options, as determined by the
Administrator at the time of grant of an option and subject to the applicable
provisions of Section 422 of the Code, as amended, and the regulations
promulgated thereunder.  Stock purchase rights may also be granted under the
Plan.

     2.   CERTAIN DEFINITIONS.  As used herein, the following definitions shall
apply:

          (a)  "ADMINISTRATOR" means the Board or any of its Committees appoint-
ed pursuant to Section 4 of the Plan.

          (b)  "BOARD" means the Board of Directors of the Company.

          (c)  "CODE" means the Internal Revenue Code of 1986, as amended.

          (d)  "COMMITTEE" means a Committee appointed by the Board of Directors
in accordance with paragraph (a) of Section 4 of the Plan.

          (e)  "COMMON STOCK" means the Common Stock of the Company.

          (f)  "COMPANY" means Physiometrix, Inc., a California corporation.

          (g)  "CONSULTANT" means any person, including an advisor, who is
engaged by the Company or any Parent or Subsidiary to render services and is
compensated for such services, and any director of the Company whether compen-
sated for such services or not provided that if and in the event the Company
registers any class of any equity security pursuant to the Exchange Act, the
term Consultant shall thereafter not include directors who are not compensated
for their services or are paid only a director's fee by the Company.

          (h)  "CONTINUOUS STATUS AS AN EMPLOYEE OR CONSULTANT" means the
absence of any interruption or termination of the employment relationship by the
Company or any Subsidiary.  Continuous Status as an Employee or Consultant shall
not be considered interrupted in the case of:  (i) sick leave; (ii) military
leave; (iii) any other leave of absence approved by the Board, provided that
such leave is for a period of not more than ninety (90) days, unless reemploy-
ment upon the expiration of such leave is guaranteed by contract or statute, or
unless provided otherwise pursuant to Company 

<PAGE>

policy adopted from time to time; or (iv) in the case of transfers between
locations of the Company or between the Company, its Subsidiaries or its
successor.

          (i)  "EMPLOYEE" means any person, including officers and directors,
employed by the Company or any Parent or Subsidiary of the Company.  The payment
of a director's fee by the Company shall not be sufficient to constitute
"employment" by the Company.

          (j)  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

          (k)  "FAIR MARKET VALUE" means, as of any date, the value of Common
Stock determined as follows:

               (i)  If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported, as quoted
on such system or exchange for the last market trading day prior to the time of
determination) as reported in the Wall Street Journal or such other source as
the Administrator deems reliable;

              (ii)  If the Common Stock is quoted on the NASDAQ System (but not
on the National Market System thereof) or regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high bid and low asked prices for the Common Stock
or;

             (iii)  In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Administrator.

          (l)  "INCENTIVE STOCK OPTION" means an Option intended to qualify as
an incentive stock option within the meaning of Section 422 of the Code.

          (m)  "NONSTATUTORY STOCK OPTION" means an Option not intended to
qualify as an Incentive Stock Option.


          (n)  "OFFICER" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

          (o)  "OPTION" means a stock option granted pursuant to the Plan.

          (p)  "OPTIONED STOCK" means the Common Stock subject to an Option.

          (q)  "OPTIONEE" means an Employee or Consultant who receives an
Option.


                                       -2-

<PAGE>

          (r)  "PARENT" means a "parent corporation", whether now or hereafter
existing, as defined in Section 424(e) of the Code.

          (s)  "PLAN" means this 1991 Stock Plan.

          (t)  "RESTRICTED STOCK" means shares of Common Stock acquired pursuant
to a grant of Stock Purchase Rights under Section 11 below.

          (u)  "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

          (v)  "SUBSIDIARY" means a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 424(f) of the Code.

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 13 of
the Plan, the maximum aggregate number of shares which may be optioned and sold
under the Plan is 1,166,400 shares of Common Stock.  The shares may be autho-
rized, but unissued, or reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan. 

     4.   ADMINISTRATION OF THE PLAN.

          (a)  PROCEDURE.

               (i)  ADMINISTRATION WITH RESPECT TO DIRECTORS AND OFFICERS.  With
respect to grants of Options or Stock Purchase Rights to Employees who are also
officers or directors of the Company, the Plan shall be administered by (A) the
Board if the Board may administer the Plan in compliance with Rule 16b-3
promulgated under the Exchange Act or any successor thereto ("Rule 16b-3") with
respect to a plan intended to qualify thereunder as a discretionary plan, or
(B) a Committee designated by the Board to administer the Plan, which Committee
shall be constituted in such a manner as to permit the Plan to comply with
Rule 16b-3 with respect to a plan intended to qualify thereunder as a discre-
tionary plan.  Once appointed, such Committee shall continue to serve in its
designated capacity until otherwise directed by the Board.  From time to time
the Board may increase the size of the Committee and appoint additional members
thereof, remove members (with or without cause) and appoint new members in
substitution therefor, fill vacancies, however caused, and remove all members of
the Committee and thereafter directly administer the Plan, all to the extent
permitted by Rule 16b-3 with respect to a plan intended to qualify thereunder as
a discretionary plan.


                                       -3-

<PAGE>

              (ii)  MULTIPLE ADMINISTRATIVE BODIES.  If permitted by Rule 16b-3,
the Plan may be administered by different bodies with respect to directors, non-
director officers and Employees who are neither directors nor officers.

             (iii)  ADMINISTRATION WITH RESPECT TO CONSULTANTS AND OTHER
EMPLOYEES.  With respect to grants of Options or Stock Purchase Rights to
Employees or Consultants who are neither directors nor officers of the Company,
the Plan shall be administered by (A) the Board or (B) a Committee designated by
the Board, which Committee shall be constituted in such a manner as to satisfy
the legal requirements relating to the administration of incentive stock option
plans, if any, of California corporate and securities laws and of the Code (the
"Applicable Laws").  Once appointed, such Committee shall continue to serve in
its designated capacity until otherwise directed by the Board.  From time to
time the Board may increase the size of the Committee and appoint additional
members thereof, remove members (with or without cause) and appoint new members
in substitution therefor, fill vacancies, however caused, and remove all members
of the Committee and thereafter directly administer the Plan, all to the extent
permitted by the Applicable Laws.

          (b)  POWERS OF THE ADMINISTRATOR.  Subject to the provisions of the
Plan and in the case of a Committee, the specific duties delegated by the Board
to such Committee, the Administrator shall have the authority, in its discre-
tion:

               (i)  to determine the Fair Market Value of the Common Stock, in
accordance with Section 2(k) of the Plan;

              (ii)  to select the Consultants and Employees to whom Options and
Stock Purchase Rights may from time to time be granted hereunder;

             (iii)  to determine whether and to what extent Options and Stock
Purchase Rights or any combination thereof, are granted hereunder;

              (iv)  to determine the number of shares of Common Stock to be
covered by each such award granted hereunder;

               (v)  to approve forms of agreement for use under the Plan;

          (vi)  to determine the terms and conditions, not inconsistent with the
terms of the Plan, of any award granted hereunder (including, but not limited
to, the share price and any restriction or limitation or waiver of forfeiture
restrictions regarding any Option or other award and/or the shares of Common
Stock relating thereto, based in each case on such factors as the Administrator
shall determine, in its sole discretion);

          (vii)  to determine whether and under what circumstances an Option may
be settled in cash under subsection 9(f) instead of Common Stock;


                                       -4-

<PAGE>

          (viii)  to determine whether, to what extent and under what circum-
stances Common Stock and other amounts payable with respect to an award under
this Plan shall be deferred either automatically or at the election of the
participant (including providing for and determining the amount, if any, of any
deemed earnings on any deferred amount during any deferral period);

          (ix)  to reduce the exercise price of any Option to the then current
Fair Market Value if the Fair Market Value of the Common Stock covered by such
Option shall have declined since the date the Option was granted; and

               (x)  to determine the terms and restrictions applicable to Stock
Purchase Rights and the Restricted Stock purchased by exercising such Stock
Purchase Rights.

          (c)  EFFECT OF ADMINISTRATOR'S DECISION.  All decisions, determina-
tions and interpretations of the Administrator shall be final and binding on all
Optionees and any other holders of any Options.

     5.   ELIGIBILITY.

          (a)  Nonstatutory Stock Options may be granted to Employees and
Consultants.  Incentive Stock Options may be granted only to Employees.  An
Employee or Consultant who has been granted an Option may, if he is otherwise
eligible, be granted an additional Option or Options.

          (b)  Each Option shall be designated in the written option agreement
as either an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designations, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options designated as Incentive Stock
Options are exercisable for the first time by any Optionee during any calendar
year (under all plans of the Company or any Parent or Subsidiary) exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

          (c)  For purposes of Section 5(b), Incentive Stock Options shall be
taken into account in the order in which they were granted, and the Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such Shares is granted.

          (d)  The Plan shall not confer upon any Optionee any right with
respect to continuation of employment or consulting relationship with the
Company, nor shall it interfere in any way with his or her right or the Company-
's right to terminate his or her employment or consulting relationship at any
time, with or without cause.

     6.   TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the share-
holders of the Company as described in Section 19 of the Plan.  It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 15 of the Plan.


                                       -5-

<PAGE>

     7.   TERM OF OPTION.  The term of each Option shall be the term stated in
the Option Agreement; provided, however, that in the case of an Incentive Stock
Option, the term shall be no more than ten (10) years from the date of grant
thereof or such shorter term as may be provided in the Option Agreement. 
However, in the case of an Option granted to an Optionee who, at the time the
Option is granted, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the term of the Option shall be five (5) years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

     8.   OPTION EXERCISE PRICE AND CONSIDERATION.

          (a)  The per share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the Board, but
shall be subject to the following:

               (i)  In the case of an Incentive Stock Option

                    (A)  granted to an Employee who, at the time of the grant of
such Incentive Stock Option, owns stock representing more than ten percent (10%)
of the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the per Share exercise price shall be no less than 110% of the Fair
Market Value per Share on the date of grant.

                    (B)  granted to any Employee, the per Share exercise price
shall be no less than 100% of the Fair Market Value per Share on the date of
grant.

               (ii)  In the case of a Nonstatutory Stock Option

                    (A)  granted to a person who, at the time of the grant of
such Option, owns stock representing more than ten percent (10%) of the voting
power of all classes of stock of the Company or any Parent or Subsidiary, the
per Share exercise price shall be no less than 110% of the Fair Market Value per
Share on the date of the grant.

                    (B)  granted to any person, the per Share exercise price
shall be no less than 85% of the Fair Market Value per Share on the date of
grant.

          (b)  The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant) and may consist entirely of (1) cash, (2) chec-
k, (3) promissory note, (4) other Shares which (x) in the case of Shares
acquired upon exercise of an Option either have been owned by the Optionee for
more than six months on the date of surrender or were not acquired, directly or
indirectly, from the Company, and (y) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised, (5) authorization from the Company to retain from the
total number of Shares as to which the Option is exercised that number of Shares
having a Fair Market Value on the 


                                       -6-

<PAGE>

date of exercise equal to the exercise price for the total number of Shares as
to which the Option is exercised, (6) delivery of a properly executed exercise
notice together with irrevocable instructions to a broker to promptly deliver to
the Company the amount of sale or loan proceeds required to pay the exercise
price, (7) by delivering an irrevocable subscription agreement for the Shares
which irrevocably obligates the option holder to take and pay for the Shares not
more than twelve months after the date of delivery of the subscription
agreement, (8) any combination of the foregoing methods of payment, or (9) such
other consideration and method of payment for the issuance of Shares to the
extent permitted under Applicable Laws.  In making its determination as to the
type of consideration to accept, the Board shall consider if acceptance of such
consideration may be reasonably expected to benefit the Company (Section 315(b)
of the California Corporation law).

     9.   EXERCISE OF OPTION.

          (a)  Procedure for Exercise; Rights as a Shareholder. Any Option
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may, as authorized by the Board, consist of any consider-
ation and method of payment allowable under Section 8(b) of the Plan.  Until the
issuance (as evidenced by the appropriate entry on the books of the Company or
of a duly authorized transfer agent of the Company) of the stock certificate
evidencing such Shares, no right to vote or receive dividends or any other
rights as a shareholder shall exist with respect to the Optioned Stock, notwith-
standing the exercise of the Option.  The Company shall issue (or cause to be
issued) such stock certificate promptly upon exercise of the Option.  No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 11 of the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

          (b)  TERMINATION OF EMPLOYMENT. In the event of termination of an
Optionee's Continuous Status as an Employee or Consultant with the Company, such
Optionee may, but only within ninety (90) days (or such other period of time as
is determined by the Administrator of at least thirty (30) days, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option and not exceeding ninety (90) days) after the date of such
termination (but in no event later than the expiration date of the term of such
Option as set forth in the Option Agree-


                                       -7-

<PAGE>

ment), exercise his or her Option to the extent that Optionee was entitled to
exercise it at the date of such termination.  To the extent that Optionee was
not entitled to exercise the Option at the date of such termination, or if
Optionee does not exercise such Option to the extent so entitled within the time
specified herein, the Option shall terminate.

          (c)  DISABILITY OF OPTIONEE. In the event of termination of an
Optionee's consulting relationship or Continuous Status as an Employee as a
result of his or her disability, Optionee may, but only within twelve (12)
months from the date of such termination (and in no event later than the
expiration date of the term of such Option as set forth in the Option Agree-
ment), exercise the Option to the extent otherwise entitled to exercise it at
the date of such termination; provided, however, that if such disability is not
a "disability" as such term is defined in Section 22(e)(3) of the Code, in the
case of Incentive Stock Option such Incentive Stock Option shall automatically
convert to a Nonstatutory Stock Option on the day three months and one day
following such termination.  To the extent that Optionee is not entitled to
exercise the Option at the date of termination, or if Optionee does not exercise
such Option to the extent so entitled within the time specified herein, the
Option shall terminate, and the Shares covered by such Option shall revert to
the Plan.

          (d)  DEATH OF OPTIONEE.  In the event of termination of an Optionee's
Continuous Status as an Employee or Consultant as a result of the death of an
Optionee, the Option may be exercised, at any time within twelve (12) months
following the date of death (but in no event later than the expiration date of
the term of such Option as set forth in the Option Agreement), by the Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance, but only to the extent the Optionee was entitled to exercise the
Option at the date of death.  To the extent that Optionee was not entitled to
exercise the Option at the date of termination, or if Optionee does not exercise
such Option to the extent so entitled within the time specified herein, the
Option shall terminate.

          (e)  RULE 16B-3.  Options granted to persons subject to Section 16(b)
of the Exchange Act must comply with Rule 16b-3 and shall contain such addition-
al conditions or restrictions as may be required thereunder to qualify for the
maximum exemption from Section 16 of the Exchange Act with respect to Plan
transactions.

          (f)  BUYOUT PROVISIONS.  The Administrator may at any time offer to
buy out for a payment in cash or Shares, an Option previously granted, based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

     10.  NON-TRANSFERABILITY OF OPTIONS.  Options may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.


                                       -8-

<PAGE>

     11.  STOCK PURCHASE RIGHTS.

          (a)  RIGHTS TO PURCHASE.  Stock Purchase Rights may be issued either
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan.  After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing of the terms, conditions and restrictions related to the
offer, including the number of Shares that such person shall be entitled to
purchase, the price to be paid (which price shall not be less than 50% of the
Fair Market Value of the Shares as of the date of the offer), and the time
within which such person must accept such offer, which shall in no event exceed
thirty (30) days from the date upon which the Administrator made the determina-
tion to grant the Stock Purchase Right.  The offer shall be accepted by execu-
tion of a Restricted Stock purchase agreement in the form determined by the
Administrator.  Shares purchased pursuant to the grant of a Stock Purchase Right
shall be referred to herein as "Restricted Stock."

          (b)  REPURCHASE OPTION.  Unless the Administrator determines other-
wise, the Restricted Stock purchase agreement shall grant the Company a repur-
chase option exercisable upon the voluntary or involuntary termination of the
purchaser's employment with the Company for any reason (including death or
disability).  The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company.  The repurchase option shall lapse at such rate as the Committee
may determine.

          (c)  OTHER PROVISIONS.  The Restricted Stock purchase agreement shall
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion.  In
addition, the provisions of Restricted Stock purchase agreements need not be the
same with respect to each purchaser.

          (d)  RIGHTS AS A SHAREHOLDER.  Once the Stock Purchase Right is
exercised, the purchaser shall have the rights equivalent to those of a share-
holder, and shall be a shareholder when his or her purchase is entered upon the
records of the duly authorized transfer agent of the Company.  No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 13
of the Plan.

     12.  STOCK WITHHOLDING TO SATISFY WITHHOLDING TAX OBLIGATIONS.  At the
discretion of the Administrator, Optionees may satisfy withholding obligations
as provided in this paragraph.  When an Optionee incurs tax liability in
connection with an Option or Stock Purchase Right, which tax liability is
subject to tax withholding under applicable tax laws, and the Optionee is
obligated to pay the Company an amount required to be withheld under applicable
tax laws, the Optionee may satisfy the withholding tax obligation by electing to
have the Company withhold from the Shares to be issued upon exercise of the
Option, or the Shares to be issued in connection with the Stock Purchase Right,
if any, that number of Shares having a Fair Market Value equal to the amount
required to be withheld.  The Fair Market Value of the Shares to be withheld
shall be determined on the date that the amount of tax to be withheld is to be
determined (the "Tax Date").


                                       -9-

<PAGE>

     All elections by an Optionee to have Shares withheld for this purpose shall
be made in writing in a form acceptable to the Administrator and shall be
subject to the following restrictions:

          (a)  the election must be made on or prior to the applicable Tax Date;

          (b)  once made, the election shall be irrevocable as to the particular
Shares of the Option or Right as to which the election is made;

          (c)  all elections shall be subject to the consent or disapproval of
the Administrator;

          (d)  if the Optionee is subject to Rule 16b-3, the election must
comply with the applicable provisions of Rule 16b-3 and shall be subject to such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

     In the event the election to have Shares withheld is made by an Optionee
and the Tax Date is deferred under Section 83 of the Code because no election is
filed under Section 83(b) of the Code, the Optionee shall receive the full
number of Shares with respect to which the Option or Stock Purchase Right is
exercised but such Optionee shall be unconditionally obligated to tender back to
the Company the proper number of Shares on the Tax Date.

     13.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER. Subject to any
required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive. 
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

          In the event of the proposed dissolution or liquidation of the
Company, the Board shall notify the Optionee at least fifteen (15) days prior to
such proposed action.  To the extent it has not been previously exercised, the
Option will terminate immediately prior to the consummation of such proposed
action.  In the event of a merger of the Company with or into another corpora-
tion, the Option shall be assumed or an equivalent option shall be substituted
by such successor corporation or 


                                      -10-

<PAGE>

a parent or subsidiary of such successor corporation.  In the event that such
successor corporation does not agree to assume the Option or to substitute an
equivalent option, the Board shall notify the Optionee that the Option shall be
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option will terminate upon the expiration of such period.


     14.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for
all purposes, be the date on which the Administrator makes the determination
granting such Option, or such other date as is determined by the Board.  Notice
of the determination shall be given to each Employee or Consultant to whom an
Option is so granted within a reasonable time after the date of such grant.

     15.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  The Board may at any time amend,
alter, suspend or discontinue the Plan, but no amendment, alteration, suspension
or discontinuation shall be made which would impair the rights of any Optionee
under any grant theretofore made, without his or her consent.  In addition, to
the extent necessary and desirable to comply with Rule 16b-3 under the Exchange
Act or with Section 422 of the Code (or any other applicable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain shareholder approval of any Plan amendment in such a manner
and to such a degree as required.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options already granted, and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated, unless mutually agreed otherwise between the Optionee and
the Board, which agreement must be in writing and signed by the Optionee and the
Company.

     16.  CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange upon which the Shares may
then be listed, and shall be further subject to the approval of counsel for the
Company with respect to such compliance.

          As a condition to the exercise of an Option, the Company may require
the person exercising such Option to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.


                                      -11-

<PAGE>

     17.  RESERVATION OF SHARES.  The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

          The inability of the Company to obtain authority from any regulatory
body having jurisdiction, which authority is deemed by the Company's counsel to
be necessary to the lawful issuance and sale of any Shares hereunder, shall
relieve the Company of any liability in respect of the failure to issue or sell
such Shares as to which such requisite authority shall not have been obtained.

     18.  AGREEMENTS.  Options and Stock Purchase Rights shall be evidenced by
written agreements in such form as the Board shall approve from time to time.

     19.  SHAREHOLDER APPROVAL.  Continuance of the Plan shall be subject to
approval by the shareholders of the Company within twelve (12) months before or
after the date the Plan is adopted.  Such shareholder approval shall be obtained
in the degree and manner required under applicable state and federal law.

     20.  INFORMATION TO OPTIONEES AND PURCHASERS.  The Company shall provide 
to each Optionee, not less frequently than annually, copies of annual 
financial statements.  The Company shall also provide such statements to each 
individual who acquires Shares pursuant to the Plan while such individual 
owns such Shares. The Company shall not be required to provide such 
statements to key employees whose duties in connection with the Company 
assure their access to equivalent information.


                                      -12-
 

<PAGE>
                               PHYSIOMETRIX, INC.

                            1996 DIRECTOR OPTION PLAN


     1.   PURPOSES OF THE PLAN.  The purposes of this 1996 Director Option Plan
are to attract and retain the best available personnel for service as Outside
Directors (as defined herein) of the Company, to provide additional incentive to
the Outside Directors of the Company to serve as Directors, and to encourage
their continued service on the Board.

          All options granted hereunder shall be nonstatutory stock options.

     2.   DEFINITIONS.  As used herein, the following definitions shall apply:

          (a)  "BOARD" means the Board of Directors of the Company.

          (b)  "CODE" means the Internal Revenue Code of 1986, as amended.

          (c)  "COMMON STOCK" means the Common Stock of the Company.

          (d)  "COMPANY" means Physiometrix, Inc., a Delaware corporation.

          (e)  "CONTINUOUS STATUS AS A DIRECTOR" means the absence of any
interruption or termination of service as a Director.

          (f)  "DIRECTOR" means a member of the Board.

          (g)  "EMPLOYEE" means any person, including officers and Directors,
employed by the Company or any Parent or Subsidiary of the Company.  The payment
of a Director's fee by the Company shall not be sufficient in and of itself to
constitute "employment" by the Company.

          (h)  "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

          (i)  "FAIR MARKET VALUE" means, as of any date, the value of Common
Stock determined as follows:

               (i)  If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market of the National Association of Securities Dealers, Inc.
Automated Quotation ("NASDAQ") System, the Fair Market Value of a Share of
Common Stock shall be the closing sales price for such stock (or the closing
bid, if no sales were reported) as quoted on such system or exchange (or the
exchange with the greatest volume of trading in Common Stock) on the day of
determination, as reported in THE WALL STREET JOURNAL or such other source as
the Board deems reliable;

               (ii) If the Common Stock is quoted on the NASDAQ System (but not
on the National Market thereof) or regularly quoted by a recognized securities
dealer but selling prices 

<PAGE>

are not reported, the Fair Market Value of a Share of Common Stock shall be the
mean between the high bid and low asked prices for the Common Stock on the day
of determination, as reported in THE WALL STREET JOURNAL or such other source as
the Board deems reliable, or;

               (iii)     In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board.

          (j)  "NEW OUTSIDE DIRECTOR" means an Outside Director who becomes a
Director after the effective date of this Plan.

          (k)  "OPTION" means a stock option granted pursuant to the Plan.

          (l)  "OPTIONED STOCK" means the Common Stock subject to an Option.

          (m)  "OPTIONEE"  means an Outside Director who receives an Option.

          (n)  "OUTSIDE DIRECTOR" means a Director who is not an Employee.

          (o)  "PARENT" means a "parent corporation", whether now or hereafter
existing, as defined in Section 424(e) of the Code.

          (p)  "PLAN" means this Physiometrix, Inc. 1996 Director Option Plan.

          (q)  "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 10 of the Plan.

          (r)  "SUBSIDIARY" means a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 424(f) of the Internal Revenue Code of
1986.

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 10 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is one hundred fifty thousand (150,000) Shares (the "Pool") of
Common Stock.  The Shares may be authorized but unissued, or reacquired Common
Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan; provided, however, that Shares that have actually
been issued under the Plan shall not be returned to the Plan and shall not
become available for future distribution under the Plan.


                                       -2-

<PAGE>


     4.   ADMINISTRATION AND GRANTS OF OPTIONS UNDER THE PLAN.

          (a)  PROCEDURE FOR GRANTS.  The provisions set forth in this Section
4(a) shall not be amended more than once every six months, other than to comport
with changes in the Code, the Employee Retirement Income Security Act of 1974,
as amended, or the rules thereunder.  All grants of Options to Outside Directors
under this Plan shall be automatic and nondiscretionary and shall be made
strictly in accordance with the following provisions:

               (i)  No person shall have any discretion to select which Outside
Directors shall be granted Options or to determine the number of Shares to be
covered by Options granted to Outside Directors.

              (ii)  Each New Outside Director shall be automatically granted an
Option to purchase fifteen thousand (15,000) Shares (a "First Option") on the
date on which such person first becomes a Director, whether through election by
the stockholders of the Company or appointment by the Board to fill a vacancy. 

             (iii)  After a First Option has been granted to a New Outside
Director or Outside Director, such individual shall thereafter be automatically
granted an Option to purchase five thousand (5,000) Shares (a "Subsequent
Option") on the first business day of each year, if on such date, he shall have
served on the Board for at least six (6) months.

              (iv)  Notwithstanding the provisions of subsections (ii) and (iii)
hereof, any exercise of an Option made before the Company has obtained
stockholder approval of the Plan in accordance with Section 16 hereof shall be
conditioned upon obtaining such stockholder approval of the Plan in accordance
with Section 16 hereof.

               (v)  The terms of a First Option granted hereunder shall be as
follows:

                    (A)  the term of the First Option shall be ten (10) years.

                    (B)  the First Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Section 8 hereof.

                    (C)  the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the First Option.  In the event
that the date of grant of the First Option is not a trading day, the exercise
price per Share shall be the Fair Market Value on the next trading day
immediately following the date of grant of the First Option.

                    (D)  the First Option shall become exercisable as to 1/48 of
the Shares subject to the First Option at the end of each full month following
the date of grant, subject to continued service as an Outside Director.


                                       -3-

<PAGE>

              (vi)  The terms of a Subsequent Option granted hereunder shall be
as follows:

                    (A)  the term of the Subsequent Option shall be ten (10)
years.

                    (B)  the Subsequent Option shall be exercisable only while
the Outside Director remains a Director of the Company, except as set forth in
Section 8 hereof.

                    (C)  the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the Subsequent Option.  In the
event that the date of grant of the First Option is not a trading day, the
exercise price per Share shall be the Fair Market Value on the next trading day
immediately following the date of grant of the First Option.

                    (D)  the Subsequent Option shall become exercisable as to
1/48 of the Shares subject to the Subsequent Option at the end of each full
month following the date of grant, subject to continued service as an Outside
Director.

             (vii)  In the event that any Option granted under the Plan would
cause the number of Shares subject to outstanding Options plus the number of
Shares previously purchased under Options to exceed the Pool, then the remaining
Shares available for Option grant shall be granted under Options to the Outside
Directors on a pro rata basis.  No further grants shall be made until such time,
if any, as additional Shares become available for grant under the Plan through
action of the stockholders to increase the number of Shares which may be issued
under the Plan or through cancellation or expiration of Options previously
granted hereunder.

     5.   ELIGIBILITY.  Options may be granted only to Outside Directors.  All
Options shall be automatically granted in accordance with the terms set forth in
Section 4 hereof.  An Outside Director who has been granted an Option may, if he
is otherwise eligible, be granted an additional Option or Options in accordance
with such provisions.

          The Plan shall not confer upon any Optionee any right with respect to
continuation of service as a Director or nomination to serve as a Director, nor
shall it interfere in any way with any rights which the Director or the Company
may have to terminate his or her directorship at any time.

     6.   TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board or its approval by the stockholders of the
Company as described in Section 16 of the Plan.  It shall continue in effect for
a term of ten (10) years unless sooner terminated under Section 11 of the Plan.

     7.   FORM OF CONSIDERATION.  The consideration to be paid for the Shares to
be issued upon exercise of an Option, including the method of payment, shall
consist of (i) cash, (ii) check, (iii) other shares which (x) in the case of
Shares acquired upon exercise of an Option, have been owned by the Optionee for
more than six (6) months on the date of surrender, and (y) have a Fair Market
Value on 


                                       -4-

<PAGE>

the date of surrender equal to the aggregate exercise price of the Shares as to
which said Option shall be exercised, (iv) delivery of a properly executed
exercise notice together with such other documentation as the Company and the
broker, if applicable, shall require to effect an exercise of the Option and
delivery to the Company of the sale or loan proceeds required to pay the
exercise price, or (v) any combination of the foregoing methods of payment.

     8.   EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE; RIGHTS AS A STOCKHOLDER. Any Option
granted hereunder shall be exercisable at such times as are set forth in
Section 4 hereof; provided, however, that no Options shall be exercisable until
stockholder approval of the Plan in accordance with Section 16 hereof has been
obtained.

          An Option may not be exercised for a fraction of a Share.

          An Option shall be deemed to be exercised when written notice of such
exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may consist of any consideration and method of payment
allowable under Section 7 of the Plan.  Until the issuance (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the stock certificate evidencing such Shares, no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option. 
A share certificate for the number of Shares so acquired shall be issued to the
Optionee as soon as practicable after exercise of the Option. No adjustment
shall be made for a dividend or other right for which the record date is prior
to the date the stock certificate is issued, except as provided in Section 10 of
the Plan.

          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

          (b)  RULE 16B-3.  Options granted to Outside Directors must comply
with the applicable provisions of Rule 16b-3 promulgated under the Exchange Act
or any successor thereto and shall contain such additional conditions or
restrictions as may be required thereunder to qualify Plan transactions, and
other transactions by Outside Directors that otherwise could be matched with
Plan transactions, for the maximum exemption from Section 16 of the Exchange
Act.

          (c)  TERMINATION OF CONTINUOUS STATUS AS A DIRECTOR.  In the event an
Optionee's Continuous Status as a Director terminates (other than upon the
Optionee's death or disability), the Optionee may exercise his or her Option,
but only within three (3) months from the date of such termination, and only to
the extent that the Optionee was entitled to exercise it on the date of such
termination (but in no event later than the expiration of its ten (10) year
term).  To the extent that the 


                                       -5-

<PAGE>

Optionee was not entitled to exercise an Option on the date of such termination,
and to the extent that the Optionee does not exercise such Option (to the extent
otherwise so entitled) within the time specified herein, the Option shall
terminate.

          (d)  DISABILITY OF OPTIONEE.  In the event Optionee's Continuous
Status as a Director terminates as a result of disability, the Optionee may
exercise his or her Option, but only within twelve (12) months from the date of
such termination, and only to the extent that the Optionee was entitled to
exercise it on the date of such termination (but in no event later than the
expiration of its ten (10) year term).  To the extent that the Optionee was not
entitled to exercise an Option on the date of termination, or if he or she does
not exercise such Option (to the extent otherwise so entitled) within the time
specified herein, the Option shall terminate.

          (e)  DEATH OF OPTIONEE.  In the event of an Optionee's death, the
Optionee's estate or a person who acquired the right to exercise the Option by
bequest or inheritance may exercise the Option, but only within twelve (12)
months following the date of death, and only to the extent that the Optionee was
entitled to exercise it on the date of death (but in no event later than the
expiration of its ten (10) year term).  To the extent that the Optionee was not
entitled to exercise an Option on the date of death, and to the extent that the
Optionee's estate or a person who acquired the right to exercise such Option
does not exercise such Option (to the extent otherwise so entitled) within the
time specified herein, the Option shall terminate.

     9.   NON-TRANSFERABILITY OF OPTIONS.  The Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     10.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER, ASSET
          SALE OR CHANGE OF CONTROL. 

          (a)  CHANGES IN CAPITALIZATION.  Subject to any required action by the
stockholders of the Company, the number of Shares covered by each outstanding
Option, the number of Shares which have been authorized for issuance under the
Plan but as to which no Options have yet been granted or which have been
returned to the Plan upon cancellation or expiration of an Option, as well as
the price per Share covered by each such outstanding Option, and the number of
Shares issuable pursuant to the automatic grant provisions of Section 4 hereof
shall be proportionately adjusted for any increase or decrease in the number of
issued Shares resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued Shares effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Except as expressly provided herein, no
issuance by the Company of shares of stock of any class, or securities
convertible into shares of stock of any class, shall affect, and no adjustment
by reason thereof shall be made with respect to, the number or price of Shares
subject to an Option.


                                       -6-

<PAGE>

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, to the extent that an Option has not
been previously exercised, it will terminate immediately prior to the
consummation of such proposed action.

          (c)  MERGER OR ASSET SALE.  In the event of a merger of the Company
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option shall be assumed or an equivalent option
shall be substituted by the successor corporation or a Parent or Subsidiary of
the successor corporation.  In the event that the successor corporation does not
agree to assume the Option or to substitute an equivalent option, each
outstanding Option shall become fully vested and exercisable, including as to
Shares as to which it would not otherwise be exercisable.  If an Option becomes
fully vested and exercisable in the event of a merger or sale of assets, the
Board shall notify the Optionee that the Option shall be fully exercisable for a
period of thirty (30) days from the date of such notice, and the Option shall
terminate upon the expiration of such period.  For the purposes of this
paragraph, the Option shall be considered assumed if, following the merger or
sale of assets, the option or right confers the right to purchase, for each
Share of Optioned Stock subject to the Option immediately prior to the merger or
sale of assets, the consideration (whether stock, cash, or other securities or
property) received in the merger or sale of assets by holders of Common Stock
for each Share held on the effective date of the transaction (and if holders
were offered a choice of consideration, the type of consideration chosen by the
holders of a majority of the outstanding Shares).

     11.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  Except as set forth in Section 4, the
Board may at any time amend, alter, suspend, or discontinue the Plan, but no
amendment, alteration, suspension, or discontinuation shall be made which would
impair the rights of any Optionee under any grant theretofore made, without his
or her consent.  In addition, to the extent necessary and desirable to comply
with Rule 16b-3 under the Exchange Act (or any other applicable law or
regulation), the Company shall obtain stockholder approval of any Plan amendment
in such a manner and to such a degree as required.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated.

     12.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for
all purposes, be the date determined in accordance with Section 4 hereof.  

     13.  CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, state securities laws, and the requirements of any stock exchange
upon which the Shares may 


                                       -7-

<PAGE>

then be listed, and shall be further subject to the approval of counsel for the
Company with respect to such compliance.

          As a condition to the exercise of an Option, the Company may require
the person exercising such Option to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares, if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

          Inability of the Company to obtain authority from any regulatory body
having jurisdiction, which authority is deemed by the Company's counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the Company of any liability in respect of the failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

     14.  RESERVATION OF SHARES.  The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     15.  OPTION AGREEMENT.  Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     16.  STOCKHOLDER APPROVAL.  Continuance of the Plan shall be subject to
approval by the stockholders of the Company at or prior to the first annual
meeting of stockholders held subsequent to the granting of an Option hereunder. 
Such stockholder approval shall be obtained in the degree and manner required
under applicable state and federal law.


                                       -8-
 

<PAGE>
                               PHYSIOMETRIX, INC.


                        1996 EMPLOYEE STOCK PURCHASE PLAN


     The following constitute the provisions of the 1996 Employee Stock Purchase
Plan of Physiometrix, Inc.

     1.   PURPOSE.  The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions.  It is the
intention of the Company to have the Plan qualify as an "Employee Stock Purchase
Plan" under Section 423 of the Internal Revenue Code of 1986, as amended.  The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

     2.   DEFINITIONS.

          (a)  "BOARD" shall mean the Board of Directors of the Company.

          (b)  "CODE" shall mean the Internal Revenue Code of 1986, as amended.

          (c)  "COMMON STOCK" shall mean the Common Stock of the Company.

          (d)  "COMPANY" shall mean Physiometrix, Inc. and any Designated
Subsidiary of the Company.

          (e)  "COMPENSATION" shall mean all W-2 compensation.

          (f)  "DESIGNATED SUBSIDIARIES" shall mean the Subsidiaries which have
been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

          (g)  "EMPLOYEE" shall mean any individual who is an Employee of the
Company for tax purposes whose customary employment with the Company is at least
twenty (20) hours per week and more than five (5) consecutive months in any
calendar year.  For purposes of the Plan, the employment relationship shall be
treated as continuing intact while the individual is on sick leave or other
leave of absence approved by the Company.  Where the period of leave exceeds 90
days and the individual's right to reemployment is not guaranteed either by
statute or by contract, the employment relationship will be deemed to have
terminated on the 91st day of such leave. 

          (h)  "ENROLLMENT DATE" shall mean the first day of each Offering
Period.

          (i)  "EXERCISE DATE" shall mean the last Trading Day of each Purchase
Period.  The first Exercise Date shall be the last Trading Day on or before
October 31, 1996.

<PAGE>

          (j)       "FAIR MARKET VALUE" shall mean, as of any date, the value of
Common Stock determined as follows:

               (1)  If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
THE WALL STREET JOURNAL or such other source as the Administrator deems
reliable, or;

               (2)  If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean of the closing bid and asked prices for the Common Stock on
the date of such determination, as reported in THE WALL STREET JOURNAL or such
other source as the Board deems reliable, or;

               (3)  In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board.

               (4)  For purposes of the Enrollment Date of the first Offering
Period, the Fair Market Value of the Common Stock shall be the Price to Public
as set forth in the final prospectus filed with the Securities and Exchange
Commission pursuant to Rule 424 under the Securities Act of 1933, as amended.

          (k)  "OFFERING PERIOD" shall mean the period of approximately 
twenty-four (24) months during which an option granted pursuant to the Plan 
may be exercised, commencing on the first Trading Day on or after May 1 and 
November 1 of each year and terminating on the last Trading Day in the 
periods ending approximately twenty-four months later.  The first day of the 
first Offering Period shall be the effective date of the Company's initial 
public offering of its Common Stock that is registered with the Securities 
and Exchange Commission. The duration and timing of Offering Periods may be 
changed pursuant to Section 4 of this Plan.

          (l)  "PLAN" shall mean this Physiometrix, Inc. 1996 Employee Stock
Purchase Plan.

          (m)  "PURCHASE PRICE" shall mean an amount equal to 85% of the
Fair Market Value of a share of Common Stock on the Enrollment Date or on the
Exercise Date, whichever is lower.  

          (n)  "PURCHASE PERIOD" shall mean the approximately six-month
period commencing after one Exercise Date and ending with the next Exercise
Date, except that the first Purchase Period of any Offering Period shall begin
on the Enrollment Date and end with the next Exercise Date.  The first Purchase
Period of the first Offering Period shall begin on the first day of the first
Offering Period and shall end on the first Exercise Date.


                                       -2-

<PAGE>

          (o)  "RESERVES" shall mean the number of shares of Common Stock
covered by each option under the Plan which have not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but not yet placed under option.

          (p)  "SUBSIDIARY" shall mean a corporation, domestic or foreign, of
which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

          (q)       "TRADING DAY" shall mean a day on which national stock
exchanges and the National Association of Securities Dealers Automated Quotation
(NASDAQ) System are open for trading.

     3.   ELIGIBILITY.

          (a)  Any Employee (as defined in Section 2(g)), who shall be employed
by the Company on a given Enrollment Date shall be eligible to participate in
the Plan.

          (b)  Any provisions of the Plan to the contrary notwithstanding, no
Employee shall be granted an option under the Plan (i) if, immediately after the
grant, such Employee (or any other person whose stock would be attributed to
such Employee pursuant to Section 424(d) of the Code) would own capital stock of
the Company and/or hold outstanding options to purchase such stock possessing
five percent (5%) or more of the total combined voting power or value of all
classes of the capital stock of the Company or of any Subsidiary, or (ii) if
such option permits his or her rights to purchase stock under all employee stock
purchase plans of the Company and its subsidiaries to accrue at a rate which
exceeds twenty-five thousand dollars ($25,000) worth of stock (determined at the
fair market value of the shares at the time such option is granted) for each
calendar year in which such option is outstanding at any time.

     4.   OFFERING PERIODS.  The Plan shall be implemented by consecutive,
overlapping Offering Periods with a new Offering Period beginning on the first
Trading Day on or after May 1 and November 1 each year, or on such other date as
the Board shall determine, and continuing thereafter until terminated in
accordance with Section 19 hereof.  The first day of the first Offering Period
shall be the effective date of the Company's initial public offering of its
Common Stock that is registered with the Securities and Exchange Commission. 
The Board shall have the power to change the duration of Offering Periods
(including the commencement dates thereof) with respect to future offerings
without stockholder approval if such change is announced at least five (5) days
prior to the scheduled beginning of the first Offering Period to be affected
thereafter.

     5.   PARTICIPATION.

          (a)  An eligible Employee may become a participant in the Plan by
completing a subscription agreement authorizing payroll deductions in the form
of Exhibit A to this Plan and filing it with the Company's payroll office prior
to the applicable Enrollment Date.


                                       -3-

<PAGE>

          (b)  Payroll deductions for a participant shall commence on the first
payroll date following the Enrollment Date and shall end on the last payroll
date in the Offering Period to which such authorization is applicable, unless
sooner terminated by the participant as provided in Section 10 hereof. 

     6.   PAYROLL DEDUCTIONS.

          (a)  At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount not exceeding twenty percent (20%) of
the Compensation which he or she receives on each pay day during the Offering
Period, and the aggregate of such payroll deductions during the Offering Period
shall not exceed twenty percent (20%) of the participant's Compensation during
said Offering Period. 

          (b)  All payroll deductions made for a participant shall be credited
to his or her account under the Plan and will be withheld in whole percentages
only.  A participant may not make any additional payments into such account.

          (c)  A participant may discontinue his or her participation in the
Plan as provided in Section 10 hereof, or may decrease the rate of his or her
payroll deductions one time during a Purchase Period by completing or filing
with the Company a new subscription agreement authorizing a change in payroll
deduction rate.  The Board may, in its discretion, limit the number of
participation rate changes during any Offering Period.  The change in rate shall
be effective with the first full payroll period following five (5) business days
after the Company's receipt of the new subscription agreement unless the Company
elects to process a given change in participation more quickly.  A participant's
subscription agreement shall remain in effect for successive Offering Periods
unless terminated as provided in Section 10 hereof.


          (d)  Notwithstanding the foregoing, to the extent necessary to comply
with Section 423(b)(8) of the Code and Section 3(b) hereof, a participant's
payroll deductions may be decreased to 0% at such time during any Purchase
Period which is scheduled to end during the current calendar year (the "Current
Purchase Period") that the aggregate of all payroll deductions which were
previously used to purchase stock under the Plan in a prior Purchase Period
which ended during that calendar year plus all payroll deductions accumulated
with respect to the Current Purchase Period equal $21,250.  Payroll deductions
shall recommence at the rate provided in such participant's subscription
agreement at the beginning of the first Purchase Period which is scheduled to
end in the following calendar year, unless terminated by the participant as
provided in Section 10 hereof.

          (e)  At the time the option is exercised, in whole or in part, or at
the time some or all of the Company's Common Stock issued under the Plan is
disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the disposition of the Common Stock.  At any time,
the Company may, but will not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding 


                                       -4-

<PAGE>

required to make available to the Company any tax deductions or benefits
attributable to sale or early disposition of Common Stock by the Employee. 

     7.   GRANT OF OPTION.  On the Enrollment Date of each Offering Period, each
eligible Employee participating in such Offering Period shall be granted an
option to purchase on each Exercise Date during such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that in no event shall
an Employee be permitted to purchase during each Purchase Period more than a
number of Shares determined by dividing $25,000 by the Fair Market Value of a
share of the Company's Common Stock on the Enrollment Date, and provided further
that such purchase shall be subject to the limitations set forth in
Sections 3(b) and 12 hereof. Exercise of the option shall occur as provided in
Section 8 hereof, unless the participant has withdrawn pursuant to Section 10
hereof, and shall expire on the last day of the Offering Period. 

     8.   EXERCISE OF OPTION.  Unless a participant withdraws from the Plan as
provided in Section 10 hereof, his or her option for the purchase of shares will
be exercised automatically on the Exercise Date, and the maximum number of full
shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account.  No fractional shares will be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Purchase Period or Offering Period, subject to earlier withdrawal by the
participant as provided in Section 10 hereof.  Any other monies left over in a
participant's account after the Exercise Date shall be returned to the
participant.  During a participant's lifetime, a participant's option to
purchase shares hereunder is exercisable only by him or her.

     9.   DELIVERY.  As promptly as practicable after each Exercise Date on
which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

     10.  WITHDRAWAL; TERMINATION OF EMPLOYMENT.

          (a)  A participant may withdraw all but not less than all the payroll
deductions credited to his or her account and not yet used to exercise his or
her option under the Plan at any time by giving written notice to the Company in
the form of Exhibit B to this Plan.  All of the participant's payroll deductions
credited to his or her account will be paid to such participant promptly after
receipt of notice of withdrawal and such participant's option for the Offering
Period will be automatically terminated, and no further payroll deductions for
the purchase of shares will be made for such Offering Period.  If a participant
withdraws from an Offering Period, payroll deductions will not resume at the
beginning of the succeeding Offering Period unless the participant delivers to
the Company a new subscription agreement.


                                       -5-

<PAGE>

          (b)  Upon a participant's ceasing to be an Employee (as defined in
Section 2(g) hereof), for any reason, he or she will be deemed to have elected
to withdraw from the Plan and the payroll deductions credited to such
participant's account during the Offering Period but not yet used to exercise
the option will be returned to such participant or, in the case of his or her
death, to the person or persons entitled thereto under Section 14 hereof, and
such participant's option will be automatically terminated.  The preceding
sentence notwithstanding, a participant who receives payment in lieu of notice
of termination of employment shall be treated as continuing to be an Employee
for the participant's customary number of hours per week of employment during
the period in which the participant is subject to such payment in lieu of
notice.

     11.  INTEREST.  No interest shall accrue on the payroll deductions of a
participant in the Plan.

     12.  STOCK.

          (a)  The maximum number of shares of the Company's Common Stock which
shall be made available for sale under the Plan shall be one hundred fifty
thousand (150,000), subject to adjustment upon changes in capitalization of the
Company as provided in Section 18 hereof.  If, on a given Exercise Date, the
number of shares with respect to which options are to be exercised exceeds the
number of shares then available under the Plan, the Company shall make a pro
rata allocation of the shares remaining available for purchase in as uniform a
manner as shall be practicable and as it shall determine to be equitable.

          (b)  The participant will have no interest or voting right in shares
covered by his option until such option has been exercised.

          (c)  Shares to be delivered to a participant under the Plan will be
registered in the name of the participant or in the name of the participant and
his or her spouse.

     13.  ADMINISTRATION.

          (a)  ADMINISTRATIVE BODY.  The Plan shall be administered by the Board
or a committee of members of the Board appointed by the Board.  The Board or its
committee shall have full and exclusive discretionary authority to construe,
interpret and apply the terms of the Plan, to determine eligibility and to
adjudicate all disputed claims filed under the Plan.  Every finding, decision
and determination made by the Board or its committee shall, to the full extent
permitted by law, be final and binding upon all parties.

          (b)  RULE 16b-3 LIMITATIONS.  Notwithstanding the provisions of
Subsection (a) of this Section 13, in the event that Rule 16b-3 promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
any successor provision ("Rule 16b-3") provides specific requirements for the
administrators of plans of this type, the Plan shall be only administered by
such a body and in such a manner as shall comply with the applicable
requirements of Rule 16b-3.  Unless 


                                       -6-

<PAGE>

permitted by Rule 16b-3, no discretion concerning decisions regarding the Plan
shall be afforded to any committee or person that is not "disinterested" as that
term is used in Rule 16b-3.

     14.  DESIGNATION OF BENEFICIARY.

          (a)  A participant may file a written designation of a beneficiary who
is to receive any shares and cash, if any, from the participant's account under
the Plan in the event of such participant's death subsequent to an Exercise Date
on which the option is exercised but prior to delivery to such participant of
such shares and cash.  In addition, a participant may file a written designation
of a beneficiary who is to receive any cash from the participant's account under
the Plan in the event of such participant's death prior to exercise of the
option.  If a participant is married and the designated beneficiary is not the
spouse, spousal consent shall be required for such designation to be effective.

          (b)  Such designation of beneficiary may be changed by the participant
at any time by written notice.  In the event of the death of a participant and
in the absence of a beneficiary validly designated under the Plan who is living
at the time of such participant's death, the Company shall deliver such shares
and/or cash to the executor or administrator of the estate of the participant,
or if no such executor or administrator has been appointed (to the knowledge of
the Company), the Company, in its discretion, may deliver such shares and/or
cash to the spouse or to any one or more dependents or relatives of the
participant, or if no spouse, dependent or relative is known to the Company,
then to such other person as the Company may designate.

     15.  TRANSFERABILITY.  Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 14 hereof) by the participant.  Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds from an Offering Period in accordance with Section 10 hereof.

     16.  USE OF FUNDS.  All payroll deductions received or held by the Company
under the Plan may be used by the Company for any corporate purpose, and the
Company shall not be obligated to segregate such payroll deductions.

     17.  REPORTS.  Individual accounts will be maintained for each participant
in the Plan.  Statements of account will be given to participating Employees at
least annually, which statements will set forth the amounts of payroll
deductions, the Purchase Price, the number of shares purchased and the remaining
cash balance, if any.

     18.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, LIQUIDATION,
MERGER OR ASSET SALE.

          (a)  CHANGES IN CAPITALIZATION.  Subject to any required action by the
shareholders of the Company, the Reserves, as well as the price per share and
the number of shares of Common 


                                       -7-


<PAGE>

Stock covered by each option under the Plan which has not yet been exercised,
shall be proportionately adjusted for any increase or decrease in the number of
issued shares of Common Stock resulting from a stock split, reverse stock split,
stock dividend, combination or reclassification of the Common Stock, or any
other increase or decrease in the number of shares of Common Stock effected
without receipt of consideration by the Company; provided, however, that
conversion of any convertible securities of the Company shall not be deemed to
have been "effected without receipt of consideration".  Such adjustment shall be
made by the Board, whose determination in that respect shall be final, binding
and conclusive.  Except as expressly provided herein, no issuance by the Company
of shares of stock of any class, or securities convertible into shares of stock
of any class, shall affect, and no adjustment by reason thereof shall be made
with respect to, the number or price of shares of Common Stock subject to an
option.

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, the Offering Periods shall terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board.

          (c)  MERGER OR ASSET SALE.  In the event of a proposed sale of all 
or substantially all of the assets of the Company, or the merger of the 
Company with or into another corporation, any Purchase Periods then in 
progress shall be shortened by setting a new Exercise Date (the "New Exercise 
Date") and any Offering Periods then in progress shall end on the New 
Exercise Date.  The New Exercise Date shall be before the date of the 
Company's proposed sale or merger. The Board shall notify each participant in 
writing, at least ten (10) business days prior to the New Exercise Date, that 
the Exercise Date for the participant's option has been changed to the New 
Exercise Date and that the participant's option shall be exercised 
automatically on the New Exercise Date, unless prior to such date the 
participant has withdrawn from the Offering Period as provided in Section 10 
hereof.

     19.  AMENDMENT OR TERMINATION.

          (a)  The Board of Directors of the Company may at any time and for any
reason terminate or amend the Plan.  Except as provided in Section 18 hereof, no
such termination can affect options previously granted, provided that an
Offering Period may be terminated by the Board of Directors on any Exercise Date
if the Board determines that the termination of the Plan is in the best
interests of the Company and its stockholders.  Except as provided in Section 18
hereof, no amendment may make any change in any option theretofore granted which
adversely affects the rights of any participant.  To the extent necessary to
comply with Rule 16b-3 or under Section 423 of the Code (or any successor rule
or provision or any other applicable law or regulation), the Company shall
obtain stockholder approval in such a manner and to such a degree as required.

          (b)  Without stockholder consent and without regard to whether any
participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a 


                                       -8-

<PAGE>

participant in order to adjust for delays or mistakes in the Company's
processing of properly completed withholding elections, establish reasonable
waiting and adjustment periods and/or accounting and crediting procedures to
ensure that amounts applied toward the purchase of Common Stock for each
participant properly correspond with amounts withheld from the participant's
Compensation, and establish such other limitations or procedures as the Board
(or its committee) determines in its sole discretion advisable which are
consistent with the Plan.

     20.  NOTICES.  All notices or other communications by a participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

     21.  CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

          As a condition to the exercise of an option, the Company may require
the person exercising such option to represent and warrant at the time of any
such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

     22.  TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company.  It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 19 hereof.

     23.  AUTOMATIC TRANSFER TO LOW PRICE OFFERING PERIOD.  To the extent
permitted by Rule 16b-3 of the Exchange Act, if the Fair Market Value of the
Common Stock on any Exercise Date in an Offering Period is lower than the Fair
Market Value of the Common Stock on the Enrollment Date of such Offering Period,
then all participants in such Offering Period shall be automatically withdrawn
from such Offering Period immediately after the exercise of their option on such
Exercise Date and automatically re-enrolled in the immediately following
Offering Period as of the first day thereof.

     24.  STOCKHOLDER APPROVAL.  Continuance of the Plan shall be subject to
approval by the stockholders of the Company within twelve (12) months before or
after the date the Plan is adopted.  Such stockholder approval shall be obtained
in the degree and manner required under applicable state and federal law.


                                       -9-

<PAGE>

                                    EXHIBIT A


                               PHYSIOMETRIX, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

                             SUBSCRIPTION AGREEMENT



_____ Original Application                          Enrollment Date: ___________
_____ Change in Payroll Deduction Rate            
_____ Change of Beneficiary(ies)


1.  ______________________________________ hereby elects to participate in the
    Physiometrix, Inc. 1996 Employee Stock Purchase Plan (the "Employee Stock
    Purchase Plan") and subscribes to purchase shares of the Company's Common
    Stock in accordance with this Subscription Agreement and the Employee Stock
    Purchase Plan.

2.  I hereby authorize payroll deductions from each paycheck in the amount of
    ____% of my Compensation on each payday (1-20%) during the Offering Period
    in accordance with the Employee Stock Purchase Plan.  (Please note that no
    fractional percentages are permitted.)

3.  I understand that said payroll deductions shall be accumulated for the
    purchase of shares of Common Stock at the applicable Purchase Price
    determined in accordance with the Employee Stock Purchase Plan.  I
    understand that if I do not withdraw from an Offering Period, any
    accumulated payroll deductions will be used to automatically exercise my
    option.

4.  I have received a copy of the complete "Physiometrix, Inc. 1996 Employee
    Stock Purchase Plan."  I understand that my participation in the Employee
    Stock Purchase Plan is in all respects subject to the terms of the Plan.  I
    understand that my ability to exercise the option under this Subscription
    Agreement is subject to obtaining stockholder approval of the Employee
    Stock Purchase Plan.

5.  Shares purchased for me under the Employee Stock Purchase Plan should be
    issued in the name(s) of (Employee or Employee and spouse only):
    ________________________________________________________________________.

6.  I understand that if I dispose of any shares received by me pursuant to the
    Plan within 2 years after the Enrollment Date (the first day of the
    Offering Period during which I purchased such shares) or one year after the
    Exercise Date, I will be treated for federal income tax purposes as having
    received ordinary income at the time of such disposition in an amount equal
    to the excess of the fair market value of the shares at the time such
    shares were purchased over the price which I paid for the shares.  I HEREBY
    AGREE TO NOTIFY THE COMPANY IN WRITING WITHIN 

<PAGE>

    30 DAYS AFTER THE DATE OF ANY DISPOSITION OF MY SHARES AND I WILL MAKE
    ADEQUATE PROVISION FOR FEDERAL, STATE OR OTHER TAX WITHHOLDING OBLIGATIONS,
    IF ANY, WHICH ARISE UPON THE DISPOSITION OF THE COMMON STOCK.  The Company
    may, but will not be obligated to, withhold from my compensation the amount
    necessary to meet any applicable withholding obligation including any
    withholding necessary to make available to the Company any tax deductions
    or benefits attributable to sale or early disposition of Common Stock by
    me. If I dispose of such shares at any time after the expiration of the 2-
    year and 1-year holding periods, I understand that I will be treated for
    federal income tax purposes as having received income only at the time of
    such disposition, and that such income will be taxed as ordinary income
    only to the extent of an amount equal to the lesser of (1) the excess of
    the fair market value of the shares at the time of such disposition over
    the purchase price which I paid for the shares, or (2) 15% of the fair
    market value of the shares on the first day of the Offering Period.  The
    remainder of the gain, if any, recognized on such disposition will be taxed
    as capital gain.

7.  I hereby agree to be bound by the terms of the Employee Stock Purchase
    Plan.  The effectiveness of this Subscription Agreement is dependent upon
    my eligibility to participate in the Employee Stock Purchase Plan.

8.  In the event of my death, I hereby designate the following as my
    beneficiary(ies) to receive all payments and shares due me under the
    Employee Stock Purchase Plan:


NAME:  (Please print)______________________________________________
                      (First)     (Middle)   (Last)


_______________________________    _____________________________________________
Relationship

                         _____________________________________________
                         (Address)


                                       -2-

<PAGE>

Employee's Social
Security Number:              ____________________________________



Employee's Address:           ____________________________________

                              ____________________________________
    
                              ____________________________________


I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.



Dated:_______________    ________________________________________
                         Signature of Employee


                         _______________________________________
                         Spouse's Signature (If beneficiary other than spouse)


                                       -3-

<PAGE>

                                    EXHIBIT B


                               PHYSIOMETRIX, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL



    The undersigned participant in the Offering Period of the Physiometrix,
Inc. 1996 Employee Stock Purchase Plan which began on ____________, 19____ (the
"Enrollment Date") hereby notifies the Company that he or she hereby withdraws
from the Offering Period.  He or she hereby directs the Company to pay to the
undersigned as promptly as practicable all the payroll deductions credited to
his or her account with respect to such Offering Period. The undersigned
understands and agrees that his or her option for such Offering Period will be
automatically terminated.  The undersigned understands further that no further
payroll deductions will be made for the purchase of shares in the current
Offering Period and the undersigned shall be eligible to participate in
succeeding Offering Periods only by delivering to the Company a new Subscription
Agreement.

                              Name and Address of Participant:

                              ________________________________
                              ________________________________
                              ________________________________


                              Signature:


                              ________________________________


                              Date:___________________________
  

<PAGE>
                                                                     EXHIBIT 5.1







                                November 21, 1996



Physiometrix, Inc.
Five Billerica Park
101 Billerica Avenue
North Billerica, Massachusetts 01862


     RE:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 to be filed by you
with the Securities and Exchange Commission on November 21, 1996 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of 1,466,400 shares of your Common Stock,
par value $0.001 per share (the "Shares"), (i) 817,428 shares of which are
issuable upon exercise of currently outstanding options under the 1991 Stock
Plan, (ii) 348,972 shares of which are available for issuance under the 1991
Stock Plan, (iii) 15,000 shares of which are issuable upon exercise of currently
outstanding options under the 1996 Director Option Plan, (iv) 135,000 shares of
which are available for issuance under the 1996 Director Option Plan, and
(v) 150,000 shares of which are available for issuance under the 1996 Employee
Stock Purchase Plan (collectively, the "Plans").  As your counsel in connection
with this transaction, we have examined the proceedings taken and are familiar
with the proceedings proposed to be taken by you in connection with the issuance
and sale of the Shares pursuant to the Plans.

     It is our opinion that, when issued and sold in the manner described in the
Plans and pursuant to the agreements which accompany each grant under the Plans,
the Shares will be legally and validly issued, fully-paid and non-assessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments thereto.

                              Very truly yours,

                              WILSON SONSINI GOODRICH & ROSATI
                              Professional Corporation
 

<PAGE>
                                                                    EXHIBIT 23.1



               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement on
Form S-8 pertaining to the 1991 Stock Plan, 1996 Director Option Plan and 1996
Employee Stock Purchase Plan of Physiometrix, Inc. of our report dated February
2, 1996, except for Note 12, as to which the date is April 3, 1996, with respect
to the financial statements of Physiometrix, Inc. included in its Registration
Statement on Form S-1 (No. 333-2138), filed with the Securities and Exchange
Commission.


                                                               Ernst & Young LLP

Boston, Massachusetts
November 21, 1996
 


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