<XBRL>
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!-- Compliance Xpressware Instance Document http://www.compliancexpressware.com/  -->
<!-- Version: 1.0.0 --><!-- Creation date:21:51:31 GMT-0800 -->
<!-- Copyright (c) Compliance Xpressware, LLP. All Rights Reserved. -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink">
  <link:roleRef roleURI="http://www.vistagen.com/taxonomy/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="vsta-20110930.xsd#role_DocumentAndEntityInformation"/>
  <link:calculationLink xlink:type="extended" xlink:role="http://www.vistagen.com/taxonomy/role/DocumentAndEntityInformation"/>
  <link:roleRef roleURI="http://www.vistagen.com/taxonomy/role/BalanceSheet" xlink:type="simple" xlink:href="vsta-20110930.xsd#role_BalanceSheet"/>
  <link:calculationLink xlink:type="extended" xlink:role="http://www.vistagen.com/taxonomy/role/BalanceSheet">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="CashAndCashEquivalentsAtCarryingValue" xlink:title="CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="AssetsCurrent" xlink:title="AssetsCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="AssetsCurrent" xlink:to="CashAndCashEquivalentsAtCarryingValue" xlink:title="calculation: AssetsCurrent to CashAndCashEquivalentsAtCarryingValue" use="optional" order="3" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="ReceivablesNetCurrent" xlink:title="ReceivablesNetCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="AssetsCurrent" xlink:to="ReceivablesNetCurrent" xlink:title="calculation: AssetsCurrent to ReceivablesNetCurrent" use="optional" order="4" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredCostsCurrent" xlink:label="DeferredCostsCurrent" xlink:title="DeferredCostsCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="AssetsCurrent" xlink:to="DeferredCostsCurrent" xlink:title="calculation: AssetsCurrent to DeferredCostsCurrent" use="optional" order="5" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="PrepaidExpenseCurrent" xlink:title="PrepaidExpenseCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="AssetsCurrent" xlink:to="PrepaidExpenseCurrent" xlink:title="calculation: AssetsCurrent to PrepaidExpenseCurrent" use="optional" order="6" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Assets" xlink:label="Assets" xlink:title="Assets"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Assets" xlink:to="AssetsCurrent" xlink:title="calculation: Assets to AssetsCurrent" use="optional" order="7" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="PropertyPlantAndEquipmentNet" xlink:title="PropertyPlantAndEquipmentNet"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Assets" xlink:to="PropertyPlantAndEquipmentNet" xlink:title="calculation: Assets to PropertyPlantAndEquipmentNet" use="optional" order="8" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="OtherAssetsNoncurrent" xlink:title="OtherAssetsNoncurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Assets" xlink:to="OtherAssetsNoncurrent" xlink:title="calculation: Assets to OtherAssetsNoncurrent" use="optional" order="9" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="AccountsPayableCurrent" xlink:title="AccountsPayableCurrent"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="LiabilitiesCurrent" xlink:title="LiabilitiesCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="AccountsPayableCurrent" xlink:title="calculation: LiabilitiesCurrent to AccountsPayableCurrent" use="optional" order="13" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="AccruedLiabilitiesCurrent" xlink:title="AccruedLiabilitiesCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="AccruedLiabilitiesCurrent" xlink:title="calculation: LiabilitiesCurrent to AccruedLiabilitiesCurrent" use="optional" order="14" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NotesAndLoansPayableCurrent" xlink:label="NotesAndLoansPayableCurrent" xlink:title="NotesAndLoansPayableCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="NotesAndLoansPayableCurrent" xlink:title="calculation: LiabilitiesCurrent to NotesAndLoansPayableCurrent" use="optional" order="15" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NotesPayableAndAccruedInterestToRelatedParties" xlink:label="NotesPayableAndAccruedInterestToRelatedParties" xlink:title="NotesPayableAndAccruedInterestToRelatedParties"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="NotesPayableAndAccruedInterestToRelatedParties" xlink:title="calculation: LiabilitiesCurrent to NotesPayableAndAccruedInterestToRelatedParties" use="optional" order="16" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_PutOptionAndNoteTermExtensionOptionLiabilities" xlink:label="PutOptionAndNoteTermExtensionOptionLiabilities" xlink:title="PutOptionAndNoteTermExtensionOptionLiabilities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="PutOptionAndNoteTermExtensionOptionLiabilities" xlink:title="calculation: LiabilitiesCurrent to PutOptionAndNoteTermExtensionOptionLiabilities" use="optional" order="17" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CapitalLeaseObligationsCurrent" xlink:label="CapitalLeaseObligationsCurrent" xlink:title="CapitalLeaseObligationsCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="CapitalLeaseObligationsCurrent" xlink:title="calculation: LiabilitiesCurrent to CapitalLeaseObligationsCurrent" use="optional" order="18" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NoninterestBearingPromissoryNotes" xlink:label="NoninterestBearingPromissoryNotes" xlink:title="NoninterestBearingPromissoryNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="NoninterestBearingPromissoryNotes" xlink:title="calculation: LiabilitiesCurrent to NoninterestBearingPromissoryNotes" use="optional" order="19" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_DeferredRevenues" xlink:label="DeferredRevenues" xlink:title="DeferredRevenues"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="DeferredRevenues" xlink:title="calculation: LiabilitiesCurrent to DeferredRevenues" use="optional" order="20" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ConvertibleNotesPayable" xlink:label="ConvertibleNotesPayable" xlink:title="ConvertibleNotesPayable"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="ConvertibleNotesPayable" xlink:title="calculation: LiabilitiesCurrent to ConvertibleNotesPayable" use="optional" order="21" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AccruedInterestOnPromissoryNotes" xlink:label="AccruedInterestOnPromissoryNotes" xlink:title="AccruedInterestOnPromissoryNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesCurrent" xlink:to="AccruedInterestOnPromissoryNotes" xlink:title="calculation: LiabilitiesCurrent to AccruedInterestOnPromissoryNotes" use="optional" order="22" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Liabilities" xlink:to="LiabilitiesCurrent" xlink:title="calculation: Liabilities to LiabilitiesCurrent" use="optional" order="23" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NotesPayableAndAccruedInterest" xlink:label="NotesPayableAndAccruedInterest" xlink:title="NotesPayableAndAccruedInterest"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="LiabilitiesNoncurrent" xlink:title="LiabilitiesNoncurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="NotesPayableAndAccruedInterest" xlink:title="calculation: LiabilitiesNoncurrent to NotesPayableAndAccruedInterest" use="optional" order="25" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NotesPayableAndAccruedInterestToRelatedPartiesNonCurrent" xlink:label="NotesPayableAndAccruedInterestToRelatedPartiesNonCurrent" xlink:title="NotesPayableAndAccruedInterestToRelatedPartiesNonCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="NotesPayableAndAccruedInterestToRelatedPartiesNonCurrent" xlink:title="calculation: LiabilitiesNoncurrent to NotesPayableAndAccruedInterestToRelatedPartiesNonCurrent" use="optional" order="26" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ConvertiblePromissoryNotesNetOfCurrentPortion" xlink:label="ConvertiblePromissoryNotesNetOfCurrentPortion" xlink:title="ConvertiblePromissoryNotesNetOfCurrentPortion"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="ConvertiblePromissoryNotesNetOfCurrentPortion" xlink:title="calculation: LiabilitiesNoncurrent to ConvertiblePromissoryNotesNetOfCurrentPortion" use="optional" order="27" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AccruedInterestOnPromissoryNotesNonCurrent" xlink:label="AccruedInterestOnPromissoryNotesNonCurrent" xlink:title="AccruedInterestOnPromissoryNotesNonCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="AccruedInterestOnPromissoryNotesNonCurrent" xlink:title="calculation: LiabilitiesNoncurrent to AccruedInterestOnPromissoryNotesNonCurrent" use="optional" order="28" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AccruedOfficersCompensation" xlink:label="AccruedOfficersCompensation" xlink:title="AccruedOfficersCompensation"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="AccruedOfficersCompensation" xlink:title="calculation: LiabilitiesNoncurrent to AccruedOfficersCompensation" use="optional" order="29" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CapitalLeaseObligationsNoncurrent" xlink:label="CapitalLeaseObligationsNoncurrent" xlink:title="CapitalLeaseObligationsNoncurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="CapitalLeaseObligationsNoncurrent" xlink:title="calculation: LiabilitiesNoncurrent to CapitalLeaseObligationsNoncurrent" use="optional" order="30" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AccountsPayableNonCurrent" xlink:label="AccountsPayableNonCurrent" xlink:title="AccountsPayableNonCurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="AccountsPayableNonCurrent" xlink:title="calculation: LiabilitiesNoncurrent to AccountsPayableNonCurrent" use="optional" order="31" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="OtherLiabilitiesNoncurrent" xlink:title="OtherLiabilitiesNoncurrent"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesNoncurrent" xlink:to="OtherLiabilitiesNoncurrent" xlink:title="calculation: LiabilitiesNoncurrent to OtherLiabilitiesNoncurrent" use="optional" order="32" weight="1"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Liabilities" xlink:to="LiabilitiesNoncurrent" xlink:title="calculation: Liabilities to LiabilitiesNoncurrent" use="optional" order="33" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="LiabilitiesAndStockholdersEquity" xlink:title="LiabilitiesAndStockholdersEquity"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesAndStockholdersEquity" xlink:to="Liabilities" xlink:title="calculation: LiabilitiesAndStockholdersEquity to Liabilities" use="optional" order="34" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="PreferredStockValue" xlink:title="PreferredStockValue"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesAndStockholdersEquity" xlink:to="PreferredStockValue" xlink:title="calculation: LiabilitiesAndStockholdersEquity to PreferredStockValue" use="optional" order="36" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CommonStockValue" xlink:label="CommonStockValue" xlink:title="CommonStockValue"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="StockholdersEquity" xlink:title="StockholdersEquity"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="StockholdersEquity" xlink:to="CommonStockValue" xlink:title="calculation: StockholdersEquity to CommonStockValue" use="optional" order="38" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="AdditionalPaidInCapital" xlink:title="AdditionalPaidInCapital"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="StockholdersEquity" xlink:to="AdditionalPaidInCapital" xlink:title="calculation: StockholdersEquity to AdditionalPaidInCapital" use="optional" order="39" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NotesReceivableFromSaleOfCommonStockToOthers" xlink:label="NotesReceivableFromSaleOfCommonStockToOthers" xlink:title="NotesReceivableFromSaleOfCommonStockToOthers"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="StockholdersEquity" xlink:to="NotesReceivableFromSaleOfCommonStockToOthers" xlink:title="calculation: StockholdersEquity to NotesReceivableFromSaleOfCommonStockToOthers" use="optional" order="40" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="RetainedEarningsAccumulatedDeficit" xlink:title="RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="StockholdersEquity" xlink:to="RetainedEarningsAccumulatedDeficit" xlink:title="calculation: StockholdersEquity to RetainedEarningsAccumulatedDeficit" use="optional" order="41" weight="1"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="LiabilitiesAndStockholdersEquity" xlink:to="StockholdersEquity" xlink:title="calculation: LiabilitiesAndStockholdersEquity to StockholdersEquity" use="optional" order="42" weight="1"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.vistagen.com/taxonomy/role/BalanceSheetParenthetical" xlink:type="simple" xlink:href="vsta-20110930.xsd#role_BalanceSheetParenthetical"/>
  <link:calculationLink xlink:type="extended" xlink:role="http://www.vistagen.com/taxonomy/role/BalanceSheetParenthetical"/>
  <link:roleRef roleURI="http://www.vistagen.com/taxonomy/role/IncomeStatement" xlink:type="simple" xlink:href="vsta-20110930.xsd#role_IncomeStatement"/>
  <link:calculationLink xlink:type="extended" xlink:role="http://www.vistagen.com/taxonomy/role/IncomeStatement">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RevenueFromGrants" xlink:label="RevenueFromGrants" xlink:title="RevenueFromGrants"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_Revenues" xlink:label="Revenues" xlink:title="Revenues"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Revenues" xlink:to="RevenueFromGrants" xlink:title="calculation: Revenues to RevenueFromGrants" use="optional" order="2" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_RevenueFromExternalCustomers" xlink:label="RevenueFromExternalCustomers" xlink:title="RevenueFromExternalCustomers"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Revenues" xlink:to="RevenueFromExternalCustomers" xlink:title="calculation: Revenues to RevenueFromExternalCustomers" use="optional" order="3" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherSalesRevenueNet" xlink:label="OtherSalesRevenueNet" xlink:title="OtherSalesRevenueNet"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="Revenues" xlink:to="OtherSalesRevenueNet" xlink:title="calculation: Revenues to OtherSalesRevenueNet" use="optional" order="4" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="OperatingIncomeLoss" xlink:title="OperatingIncomeLoss"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="OperatingIncomeLoss" xlink:to="Revenues" xlink:title="calculation: OperatingIncomeLoss to Revenues" use="optional" order="5" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="ResearchAndDevelopmentExpense" xlink:title="ResearchAndDevelopmentExpense"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="OperatingExpenses" xlink:title="OperatingExpenses"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="OperatingExpenses" xlink:to="ResearchAndDevelopmentExpense" xlink:title="calculation: OperatingExpenses to ResearchAndDevelopmentExpense" use="optional" order="7" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AcquiredInProcessResearchAndDevelopment" xlink:label="AcquiredInProcessResearchAndDevelopment" xlink:title="AcquiredInProcessResearchAndDevelopment"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="OperatingExpenses" xlink:to="AcquiredInProcessResearchAndDevelopment" xlink:title="calculation: OperatingExpenses to AcquiredInProcessResearchAndDevelopment" use="optional" order="8" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="GeneralAndAdministrativeExpense" xlink:title="GeneralAndAdministrativeExpense"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="OperatingExpenses" xlink:to="GeneralAndAdministrativeExpense" xlink:title="calculation: OperatingExpenses to GeneralAndAdministrativeExpense" use="optional" order="9" weight="1"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="OperatingIncomeLoss" xlink:to="OperatingExpenses" xlink:title="calculation: OperatingIncomeLoss to OperatingExpenses" use="optional" order="10" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="OperatingIncomeLoss" xlink:title="calculation: IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments to OperatingIncomeLoss" use="optional" order="11" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestExpense" xlink:label="InterestExpense" xlink:title="InterestExpense"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="InterestExpense" xlink:title="calculation: IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments to InterestExpense" use="optional" order="13" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ChangeInPutAndNoteExtensionOptionAndWarrantLiabilities" xlink:label="ChangeInPutAndNoteExtensionOptionAndWarrantLiabilities" xlink:title="ChangeInPutAndNoteExtensionOptionAndWarrantLiabilities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="ChangeInPutAndNoteExtensionOptionAndWarrantLiabilities" xlink:title="calculation: IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments to ChangeInPutAndNoteExtensionOptionAndWarrantLiabilities" use="optional" order="14" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_OtherIncome" xlink:label="OtherIncome" xlink:title="OtherIncome"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:to="OtherIncome" xlink:title="calculation: IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments to OtherIncome" use="optional" order="15" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="NetIncomeLoss" xlink:title="NetIncomeLoss"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetIncomeLoss" xlink:to="IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="calculation: NetIncomeLoss to IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" use="optional" order="16" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="IncomeTaxExpenseBenefit" xlink:title="IncomeTaxExpenseBenefit"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetIncomeLoss" xlink:to="IncomeTaxExpenseBenefit" xlink:title="calculation: NetIncomeLoss to IncomeTaxExpenseBenefit" use="optional" order="17" weight="-1"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.vistagen.com/taxonomy/role/CashFlows" xlink:type="simple" xlink:href="vsta-20110930.xsd#role_CashFlows"/>
  <link:calculationLink xlink:type="extended" xlink:role="http://www.vistagen.com/taxonomy/role/CashFlows">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="NetIncomeLoss" xlink:title="NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="NetCashProvidedByUsedInOperatingActivities" xlink:title="NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="NetIncomeLoss" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to NetIncomeLoss" use="optional" order="2" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="DepreciationAndAmortization" xlink:title="DepreciationAndAmortization"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="DepreciationAndAmortization" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to DepreciationAndAmortization" use="optional" order="4" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AcquiredInProcessResearchAndDevelopment" xlink:label="AcquiredInProcessResearchAndDevelopment" xlink:title="AcquiredInProcessResearchAndDevelopment"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="AcquiredInProcessResearchAndDevelopment" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to AcquiredInProcessResearchAndDevelopment" use="optional" order="5" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AmortizationOfImputedDiscountOnNonInterestBearingNotes" xlink:label="AmortizationOfImputedDiscountOnNonInterestBearingNotes" xlink:title="AmortizationOfImputedDiscountOnNonInterestBearingNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="AmortizationOfImputedDiscountOnNonInterestBearingNotes" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to AmortizationOfImputedDiscountOnNonInterestBearingNotes" use="optional" order="6" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AmortizationOfDiscountsOn775And10ConvertibleNotes" xlink:label="AmortizationOfDiscountsOn775And10ConvertibleNotes" xlink:title="AmortizationOfDiscountsOn775And10ConvertibleNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="AmortizationOfDiscountsOn775And10ConvertibleNotes" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to AmortizationOfDiscountsOn775And10ConvertibleNotes" use="optional" order="7" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AmortizationOfDiscountsOnPlatinumNotes" xlink:label="AmortizationOfDiscountsOnPlatinumNotes" xlink:title="AmortizationOfDiscountsOnPlatinumNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="AmortizationOfDiscountsOnPlatinumNotes" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to AmortizationOfDiscountsOnPlatinumNotes" use="optional" order="8" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_AmortizationOfDiscountsOnAugust2010ShortTermNotes" xlink:label="AmortizationOfDiscountsOnAugust2010ShortTermNotes" xlink:title="AmortizationOfDiscountsOnAugust2010ShortTermNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="AmortizationOfDiscountsOnAugust2010ShortTermNotes" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to AmortizationOfDiscountsOnAugust2010ShortTermNotes" use="optional" order="9" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ChangeInPutAndNoteTermExtensionOptionAndWarrantLiabilities" xlink:label="ChangeInPutAndNoteTermExtensionOptionAndWarrantLiabilities" xlink:title="ChangeInPutAndNoteTermExtensionOptionAndWarrantLiabilities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="ChangeInPutAndNoteTermExtensionOptionAndWarrantLiabilities" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to ChangeInPutAndNoteTermExtensionOptionAndWarrantLiabilities" use="optional" order="10" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="ShareBasedCompensation" xlink:title="ShareBasedCompensation"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="ShareBasedCompensation" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to ShareBasedCompensation" use="optional" order="11" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:label="IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:title="IssuanceOfStockAndWarrantsForServicesOrClaims"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IssuanceOfStockAndWarrantsForServicesOrClaims" use="optional" order="12" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ConsultingServicesByRelatedPartiesSettledByIssuingPromissoryNotes" xlink:label="ConsultingServicesByRelatedPartiesSettledByIssuingPromissoryNotes" xlink:title="ConsultingServicesByRelatedPartiesSettledByIssuingPromissoryNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="ConsultingServicesByRelatedPartiesSettledByIssuingPromissoryNotes" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to ConsultingServicesByRelatedPartiesSettledByIssuingPromissoryNotes" use="optional" order="13" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="GainLossOnSaleOfPropertyPlantEquipment" xlink:title="GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="GainLossOnSaleOfPropertyPlantEquipment" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to GainLossOnSaleOfPropertyPlantEquipment" use="optional" order="14" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="IncreaseDecreaseInAccountsReceivable" xlink:title="IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IncreaseDecreaseInAccountsReceivable" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IncreaseDecreaseInAccountsReceivable" use="optional" order="16" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:title="IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" use="optional" order="17" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="IncreaseDecreaseInDepositOtherAssets" xlink:title="IncreaseDecreaseInDepositOtherAssets"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IncreaseDecreaseInDepositOtherAssets" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IncreaseDecreaseInDepositOtherAssets" use="optional" order="18" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:title="IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" use="optional" order="19" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="IncreaseDecreaseInDeferredRevenue" xlink:title="IncreaseDecreaseInDeferredRevenue"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInOperatingActivities" xlink:to="IncreaseDecreaseInDeferredRevenue" xlink:title="calculation: NetCashProvidedByUsedInOperatingActivities to IncreaseDecreaseInDeferredRevenue" use="optional" order="20" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:title="CashAndCashEquivalentsPeriodIncreaseDecrease"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="NetCashProvidedByUsedInOperatingActivities" xlink:title="calculation: CashAndCashEquivalentsPeriodIncreaseDecrease to NetCashProvidedByUsedInOperatingActivities" use="optional" order="21" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquireMachineryAndEquipment" xlink:label="PaymentsToAcquireMachineryAndEquipment" xlink:title="PaymentsToAcquireMachineryAndEquipment"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="NetCashProvidedByUsedInInvestingActivities" xlink:title="NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInInvestingActivities" xlink:to="PaymentsToAcquireMachineryAndEquipment" xlink:title="calculation: NetCashProvidedByUsedInInvestingActivities to PaymentsToAcquireMachineryAndEquipment" use="optional" order="23" weight="-1"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="NetCashProvidedByUsedInInvestingActivities" xlink:title="calculation: CashAndCashEquivalentsPeriodIncreaseDecrease to NetCashProvidedByUsedInInvestingActivities" use="optional" order="24" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="ProceedsFromIssuanceOfCommonStock" xlink:title="ProceedsFromIssuanceOfCommonStock"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="NetCashProvidedByUsedInFinancingActivities" xlink:title="NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="ProceedsFromIssuanceOfCommonStock" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to ProceedsFromIssuanceOfCommonStock" use="optional" order="26" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:label="ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:title="ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to ProceedsFromIssuanceOfPreferredStockAndPreferenceStock" use="optional" order="27" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromUnsecuredLinesOfCredit" xlink:label="ProceedsFromUnsecuredLinesOfCredit" xlink:title="ProceedsFromUnsecuredLinesOfCredit"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="ProceedsFromUnsecuredLinesOfCredit" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to ProceedsFromUnsecuredLinesOfCredit" use="optional" order="28" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ProceedsFromIssuanceOf7NotePayableToFoundingStockholder" xlink:label="ProceedsFromIssuanceOf7NotePayableToFoundingStockholder" xlink:title="ProceedsFromIssuanceOf7NotePayableToFoundingStockholder"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="ProceedsFromIssuanceOf7NotePayableToFoundingStockholder" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to ProceedsFromIssuanceOf7NotePayableToFoundingStockholder" use="optional" order="29" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOf7ConvertibleNotes" xlink:label="NetProceedsFromIssuanceOf7ConvertibleNotes" xlink:title="NetProceedsFromIssuanceOf7ConvertibleNotes"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOf7ConvertibleNotes" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOf7ConvertibleNotes" use="optional" order="30" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOf10ConvertibleNotesAndWarrants" xlink:label="NetProceedsFromIssuanceOf10ConvertibleNotesAndWarrants" xlink:title="NetProceedsFromIssuanceOf10ConvertibleNotesAndWarrants"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOf10ConvertibleNotesAndWarrants" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOf10ConvertibleNotesAndWarrants" use="optional" order="31" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOfPlatinumNotesAndWarrants" xlink:label="NetProceedsFromIssuanceOfPlatinumNotesAndWarrants" xlink:title="NetProceedsFromIssuanceOfPlatinumNotesAndWarrants"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOfPlatinumNotesAndWarrants" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOfPlatinumNotesAndWarrants" use="optional" order="32" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOf20082010NotesAndWarrants" xlink:label="NetProceedsFromIssuanceOf20082010NotesAndWarrants" xlink:title="NetProceedsFromIssuanceOf20082010NotesAndWarrants"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOf20082010NotesAndWarrants" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOf20082010NotesAndWarrants" use="optional" order="33" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOf20062007NotesAndWarrants" xlink:label="NetProceedsFromIssuanceOf20062007NotesAndWarrants" xlink:title="NetProceedsFromIssuanceOf20062007NotesAndWarrants"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOf20062007NotesAndWarrants" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOf20062007NotesAndWarrants" use="optional" order="34" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_ProceedsFromIssuanceOf7NotesPayable" xlink:label="ProceedsFromIssuanceOf7NotesPayable" xlink:title="ProceedsFromIssuanceOf7NotesPayable"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="ProceedsFromIssuanceOf7NotesPayable" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to ProceedsFromIssuanceOf7NotesPayable" use="optional" order="35" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="vsta-20110930.xsd#vsta_NetProceedsFromIssuanceOfAugust2010ShortTermNotesAndWarrants" xlink:label="NetProceedsFromIssuanceOfAugust2010ShortTermNotesAndWarrants" xlink:title="NetProceedsFromIssuanceOfAugust2010ShortTermNotesAndWarrants"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="NetProceedsFromIssuanceOfAugust2010ShortTermNotesAndWarrants" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to NetProceedsFromIssuanceOfAugust2010ShortTermNotesAndWarrants" use="optional" order="36" weight="1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="RepaymentsOfLongTermCapitalLeaseObligations" xlink:title="RepaymentsOfLongTermCapitalLeaseObligations"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="RepaymentsOfLongTermCapitalLeaseObligations" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to RepaymentsOfLongTermCapitalLeaseObligations" use="optional" order="37" weight="-1"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RepaymentsOfNotesPayable" xlink:label="RepaymentsOfNotesPayable" xlink:title="RepaymentsOfNotesPayable"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="NetCashProvidedByUsedInFinancingActivities" xlink:to="RepaymentsOfNotesPayable" xlink:title="calculation: NetCashProvidedByUsedInFinancingActivities to RepaymentsOfNotesPayable" use="optional" order="38" weight="-1"/>
    <link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="NetCashProvidedByUsedInFinancingActivities" xlink:title="calculation: CashAndCashEquivalentsPeriodIncreaseDecrease to NetCashProvidedByUsedInFinancingActivities" use="optional" order="39" weight="1"/>
  </link:calculationLink>
</link:linkbase>
</XBRL>
