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

FIRST AMENDMENT TO

LEASE DATED MARCH 20, 2000

BY AND BETWEEN

ROTUNDA PARTNERS II, A CALIFORNIA LIMITED LIABILITY COMPANY, AS LANDLORD

AND

SCIENTIFIC LEARNING CORPORATION, A DELAWARE CORPORATION, AS TENANT

THIS FIRST AMENDMENT TO LEASE is dated December 29, 2000 for reference purposes
only, and is made by and between ROTUNDA PARTNERS II, a California limited
liability company (“Landlord”) and SCIENTIFIC LEARNING CORPORATION, a Delaware
corporation (“Tenant”), to be effective and binding upon the parties as of the
date the last of the designated signatories to this First Amendment shall have
executed the Amendment.

WHEREAS, Landlord and Tenant have entered into the Lease dated March 20, 2000
(“the “Original Lease”); and

WHEREAS, it now appears that the Delivery Date, as defined in the Lease, will be
delayed beyond the date originally contemplated.

NOW, THEREFORE, Landlord and Tenant hereby agree as follows:

1. Section 2.4 of the Original Lease is hereby amended to read in full as
follows:

       ”2.4 Delivery Of Possession. Landlord shall deliver to Tenant possession
of the Leased Premises upon Substantial Completion of the Improvements as that
term is defined in the Work Letter (defined in Section 2.5) attached hereto as
Exhibit B. The date that the Leased Premises are so delivered to the Tenant
shall be deemed the “Delivery Date.” The Intended Delivery Date is March 17,
2001, extended for such number of days as Landlord may be delayed in delivering
possession of the Leased Premises to Tenant by reason of the action or inaction
of Tenant. If Landlord is unable to so deliver possession of the Leased Premises
to Tenant in the agreed condition on or before the Intended Delivery Date, then
Tenant shall be entitled to receive a credit of two (2) days of free rent for
each day after the Intended Delivery Date that the Leased Premises are not so
delivered to Tenant, which free rent shall apply to the first months in which
Base Monthly Rent is due. In addition, if Landlord is unable to so deliver
possession of the Leased Premises to Tenant in the agreed condition on or before
May 1, 2001 (extended for such number of days as Landlord may be delayed in
delivering possession of the Leased Premises to Tenant by reason of the action
or inaction of Tenant), Tenant shall have the right to terminate this Lease. If
Tenant terminates the Lease, Landlord shall not be liable in damages to Tenant
for any delay. If Tenant elects to receive the credit rather than electing to
terminate this lease, Tenant may not thereafter terminate this Lease based upon
this paragraph.

2. In Exhibit B to the Original Lease (the Work Letter), Section 1 is hereby
amended to read in full as follows:

       “1. Construction of Improvements in Original Build-out Space. Landlord
shall retain Pankow Special Projects Limited, or other contractor

1.

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

  selected by Tenant and approved by Landlord (which approval shall not be
unreasonably withheld or delayed) (“Landlord’s Contractor”) to furnish and
install within the Original Build-out Space, certain items of general
construction (the “Improvements”) as described by: (i) the plans prepared by
Architectural Dimensions, Inc. (the “Landlord’s Architect”) dated March 13, 2000
and attached and incorporated herein as Schedule 1 to the Work Letter, and
approved by Hooks Design and Architecture (“Tenant’s Architect”); (ii) the seven
page untitled outline of Tenant’s requirements for its build-out dated “March
15, 2000 Revised”, attached and incorporated herein as Schedule 2 to the Work
Letter; and (iii) Pankow Special Projects L.P.’s revised preliminary budget
estimate dated March 2, 2000, attached and incorporated herein as Schedule 3 to
the Work Letter. Landlord shall cause the Improvements to be completed by March
16, 2001. The Landlord’s Architect and Tenant’s Architect are collectively
referred to as “Architects”.

3. In Exhibit B to the Original Lease (the Work Letter), Section 4 is hereby
amended to read in full as follows:

  “4. Completion Date of Improvements. Landlord hereby agrees to construct the
Base Building Improvements in the Original Build-out Space and in the Expansion
Space in accordance with the Base Building Plans in good and workmanlike manner
and in compliance with all applicable laws and regulations, at Landlord’s sole
cost and expense except as expressly set forth in this Work Letter, and to
complete the Improvements by March 16, 2001.”

4. In addition to the Improvements and the Base Building Improvements, which
Landlord is required to construct and furnish at Landlord’s expense, Landlord
and Tenant have also agreed that Landlord shall retain Pankow Special Projects
Limited to perform the additional work on the Premises detailed on Exhibit 1
(which work is referred to as “Tenant-Borne Improvements”).

Landlord has agreed to initially pay the costs of the Tenant-Borne Improvements,
provided that Tenant shall repay Landlord for the actual costs incurred in
making the Tenant-Borne Improvements, which may not exceed $200,000 (the
“Tenant-Borne Improvement Costs”), in monthly installments over the first 18
months of the Lease Term. The amount of each monthly installment shall be
determined by amortizing the Tenant-Borne Improvement Costs (together with
simple interest at a rate of ten percent (10%)) over the 18 month period. Each
monthly installment shall be paid to Landlord as additional rent under section
3.2(e) of the Original Lease.

Exhibit 1 may be amended hereafter by execution of a revised Exhibit 1 by
Landlord and Tenant.

5. All defined terms used in this First Amendment shall have the same meaning as
in the Original Lease, except as expressly modified by this First Amendment.

2.

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

6. Except as expressly modified by this First Amendment, the Original Lease
shall remain in full force and effect.

     IN WITNESS WHEREOF, Landlord and Tenant have executed this First Amendment
on the respective dates below set forth with the intent to be legally bound
thereby as of the Effective Date of this Amendment first above set forth.

LANDLORD:

ROTUNDA PARTNERS II, a California LLC

Dated:     1/08/01                   

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

             By:     /S/ Mark A.
Moss                                                        

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

          Mark A. Moss
          Managing Member

    TENANT:

SCIENTIFIC LEARNING CORPORATION, a Delaware corporation

Dated:     1/04/01                               

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

  By:     /S/ Frank
Mattson                                                        

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

    Title:     
President                                                                  

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

3.

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

EXHIBIT 1 TO FIRST AMENDMENT TO LEASE

LIST OF TENANT-BORNE IMPROVEMENTS

Description of Work

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

FOB cost

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

  Pankow
overhead

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

    Total cost

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

    4 each 208V isolation transformer   $       17,768     $            2,221  
  $      19,989                           Wood lockers   $         2,715    
$               339     $        3,054     Wood locker installation  
$            720     $                 90     $           810                  
        dB sound block (7 rolls)   $         4,200     $               525    
$        4,725     installation of sound wall   $         7,687    
$               961     $        8,648     installation of dB block within wall
  $         1,665     $               208     $        1,873     less normal
wall installation at 31' X $65   $        (2,015 )   $              (252 )  
$       (2,267 )                         Shower facilities, as described in
building
construction plans dated August 18, 2000   $ 25,000.00     $           3,125    
$     28,125     Hot water heater   $ 15,000.00     $           1,875    
$     16,875                           7th floor column removal   $  86,368.00  
  $                 —     $      86,368                           Total        
      $   168,201                           Amortized over 18 months/ per month
charge               $10,101.63

Actual costs in regular type
Estimated costs in italics

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

SECOND AMENDMENT TO

LEASE DATED MARCH 20, 2000

BY AND BETWEEN

ROTUNDA PARTNERS II, A CALIFORNIA LIMITED LIABILITY COMPANY, AS LANDLORD

AND

SCIENTIFIC LEARNING CORPORATION, A DELAWARE CORPORATION, AS TENANT

THIS SECOND AMENDMENT TO LEASE is dated June 15, 2001 for reference purposes
only, and is made by and between ROTUNDA PARTNERS II, a California limited
liability company (“Landlord”) and SCIENTIFIC LEARNING CORPORATION, a Delaware
corporation (“Tenant”), to be effective and binding upon the parties as of the
date the last of the designated signatories to this Second Amendment shall have
executed the Amendment.

WHEREAS, Landlord and Tenant have entered into the Lease dated March 20, 2000
and a First Amendment to Lease, dated December 29, 2000 (collectively, the
“Existing Lease”); and

WHEREAS, Landlord and Tenant now wish to finalize their agreement with respect
to payment of the costs for the additional work on the Premises that was
requested by Tenant in addition to the Improvements and the Base Building
Improvements.

NOW, THEREFORE, Landlord and Tenant hereby agree as follows:

1. In addition to the Improvements and the Base Building Improvements, which
Landlord was required to construct and furnish at Landlord’s expense, and
pursuant to the agreement of Landlord and Tenant, Landlord retained Pankow
Special Projects Limited to perform additional work on the Premises requested by
Tenant, all of which work has been completed (the “Tenant-Borne Improvements”) .
Landlord has agreed to pay all costs of the Tenant-Borne Improvements. In
exchange therefore, Tenant has agreed to pay Landlord the sum of $250,000, in
monthly installments. The amount of each monthly installment shall be determined
by amortizing $200,000 (together with simple interest at a rate of ten percent
(10%)) over the 18 month period commencing April 1, 2001 and amortizing $50,000
(together with simple interest at a rate of ten percent (10%)) over the 15 month
period beginning July 1, 2001. Each monthly installment shall be paid to
Landlord as additional rent under section 3.2(e) of the Existing Lease. Tenant
shall not have any further liability for any work on the Premises performed
through the date of this Second Amendment.

2. All defined terms used in this Second Amendment shall have the same meaning
as in the Existing Lease, except as expressly modified by this Second Amendment.

3. Except as expressly modified by this Second Amendment, the Existing Lease
shall remain in full force and effect.

1.

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

     IN WITNESS WHEREOF, Landlord and Tenant have executed this Second Amendment
on the respective dates below set forth with the intent to be legally bound
thereby as of the Effective Date of this Amendment first above set forth.

LANDLORD:

ROTUNDA PARTNERS II, a California LLC

Dated:     6/15/01                   

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

             By:     /S/ Mark A.
Moss                                                        

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

          Mark A. Moss
          Managing Member

    TENANT:

SCIENTIFIC LEARNING CORPORATION, a Delaware corporation

Dated:     6/15/01                               

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

  By:     /S/ Frank
Mattson                                                        

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

    Title:     
President                                                                  

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

2.