<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-03-02T15:20:46.2251048+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : c8b4971754cc45d9b3bab20d4b8eaa4d -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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        <link:definition>100860 - Disclosure - Supplementary Financial Information (Unaudited) - Summary of Selected Financial Information for Quarterly Periods (Details)</link:definition>
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  <xsd:element id="stim_AccruedOfFinalPaymentFee" name="AccruedOfFinalPaymentFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_AdjustmentsToAdditionalPaidInCapitalConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrants" name="AdjustmentsToAdditionalPaidInCapitalConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_IssuanceCostsOnIssuanceOfCommonStock" name="IssuanceCostsOnIssuanceOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_CostOfRentalUnitsPurchasedByCustomers" name="CostOfRentalUnitsPurchasedByCustomers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_NonCashGainsLossesOnExtinguishmentOfDebt" name="NonCashGainsLossesOnExtinguishmentOfDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_IncreaseDecreaseInNetInvestmentInSalesTypeLeases" name="IncreaseDecreaseInNetInvestmentInSalesTypeLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_IncreaseDecreaseInLeaseholdReimbursement" name="IncreaseDecreaseInLeaseholdReimbursement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_IncreaseDecreaseInPrepaidCommissionExpense" name="IncreaseDecreaseInPrepaidCommissionExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_TransferOfInventoryToPropertyAndEquipment" name="TransferOfInventoryToPropertyAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_ConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrant" name="ConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_LeasesOfLesseeAndLessorDisclosureTextBlock" name="LeasesOfLesseeAndLessorDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LeasesPolicyTextBlock" name="LeasesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" name="ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DescriptionOfBusinessLineItems" name="DescriptionOfBusinessLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DescriptionOfBusinessTable" name="DescriptionOfBusinessTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_PaycheckProtectionProgramMember" name="PaycheckProtectionProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SiliconValleyBankMember" name="SiliconValleyBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ThirtyFiveMillionCreditFacilityMember" name="ThirtyFiveMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OxfordFinanceLimitedLiabilityCompanyMember" name="OxfordFinanceLimitedLiabilityCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ComputersAndSoftwareMember" name="ComputersAndSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_LaboratoryAndOfficeEquipmentMember" name="LaboratoryAndOfficeEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DevicesInRentalAgreementProgramMember" name="DevicesInRentalAgreementProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_BalanceSheetMember" name="BalanceSheetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_IncomeStatementMember" name="IncomeStatementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DistributionAgreementPeriod" name="DistributionAgreementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DistributionAgreementRenewalPeriod" name="DistributionAgreementRenewalPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NumberOfCustomerAccountedForMoreThanTenPercentageOfRevenues" name="NumberOfCustomerAccountedForMoreThanTenPercentageOfRevenues" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AreaOfLeaseFacility" name="AreaOfLeaseFacility" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_LesseeOperatingLeaseExtendedDateOfMaturityMonthAndYear" name="LesseeOperatingLeaseExtendedDateOfMaturityMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AdditionalLeaseFacilityAreaThroughModificationOfContract" name="AdditionalLeaseFacilityAreaThroughModificationOfContract" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_AggregateAreaOfLeaseFacility" name="AggregateAreaOfLeaseFacility" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_LesseeOperatingLeaseDateOfMaturityMonthAndYear" name="LesseeOperatingLeaseDateOfMaturityMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LeasesLineItems" name="LeasesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_LeasesTable" name="LeasesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_HeadquartersAndOfficeEquipmentIncludingCopiersMember" name="HeadquartersAndOfficeEquipmentIncludingCopiersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OfficeEquipmentIncludingCopiersMember" name="OfficeEquipmentIncludingCopiersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NeuroStarAdvancedTherapySystemsMember" name="NeuroStarAdvancedTherapySystemsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" name="RightOfUseAssetsObtainedInExchangeForLeaseObligationsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_AmortizationPeriodOfDeferredSalesCommissions" name="AmortizationPeriodOfDeferredSalesCommissions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AccruedResearchAndDevelopmentExpenseCurrent" name="AccruedResearchAndDevelopmentExpenseCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_SolarCapitalLtdMember" name="SolarCapitalLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_FiftyMillionCreditFacilityMember" name="FiftyMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_FifteenMillionCreditFacilityMember" name="FifteenMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermALoanMember" name="TermALoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermBLoanMember" name="TermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermALoanAndTermBLoanMember" name="TermALoanAndTermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_FiveMillionCreditFacilityMember" name="FiveMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermCLoanMember" name="TermCLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TermLoansNumberOfTranches" name="TermLoansNumberOfTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityInterestOnlyPeriod" name="LineOfCreditFacilityInterestOnlyPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" name="LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NumberOfDefaultEvents" name="NumberOfDefaultEvents" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" name="LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityPrepaymentFeesPercentage" name="LineOfCreditFacilityPrepaymentFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_TrailingTwelveMonthNetProductRevenueFirstThresholdLimitToPayExitFee" name="TrailingTwelveMonthNetProductRevenueFirstThresholdLimitToPayExitFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_TrailingTwelveMonthNetProductRevenueSecondThresholdLimitToPayExitFee" name="TrailingTwelveMonthNetProductRevenueSecondThresholdLimitToPayExitFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_PercentageOfExitFeeForLiquidationDissolutionWindingUpOrChangeOfControl" name="PercentageOfExitFeeForLiquidationDissolutionWindingUpOrChangeOfControl" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_PercentageOfExitFeeUponAchievementOfAnyTrailingTwelveMonthRevenues" name="PercentageOfExitFeeUponAchievementOfAnyTrailingTwelveMonthRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_PercentageOfExitFeeUponAchievementOfBothTrailingTwelveMonthRevenues" name="PercentageOfExitFeeUponAchievementOfBothTrailingTwelveMonthRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_CappedExitFeePercentageOnTermLoanPrincipalAmount" name="CappedExitFeePercentageOnTermLoanPrincipalAmount" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ExtendedPeriodOfInterestOnlyTermLoan" name="ExtendedPeriodOfInterestOnlyTermLoan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_AmendmentFeePayable" name="AmendmentFeePayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_LongTermDebtPercentageBearingVariableInterestRateFloor" name="LongTermDebtPercentageBearingVariableInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_LineOfCreditFacilityFinalPaymentFeesPercentage" name="LineOfCreditFacilityFinalPaymentFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DebtInstrumentFinalPaymentFee" name="DebtInstrumentFinalPaymentFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_StockholdersDeficitLineItems" name="StockholdersDeficitLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_StockholdersDeficitTable" name="StockholdersDeficitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesDConvertiblePreferredStockMember" name="SeriesDConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesEConvertiblePreferredStockMember" name="SeriesEConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesFConvertiblePreferredStockMember" name="SeriesFConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesGConvertiblePreferredStockMember" name="SeriesGConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesATwoConvertiblePreferredStockMember" name="SeriesATwoConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_SeriesBConvertiblePreferredStockMember" name="SeriesBConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <xsd:element id="stim_SharesOfCommonStockReservedForIssuanceAbstract" name="SharesOfCommonStockReservedForIssuanceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_CommonStockSharesIssuedAndReservedForFutureIssuance" name="CommonStockSharesIssuedAndReservedForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
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  <xsd:element id="stim_ExercisePriceRangeOneMember" name="ExercisePriceRangeOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeTwoMember" name="ExercisePriceRangeTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeThreeMember" name="ExercisePriceRangeThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeFourMember" name="ExercisePriceRangeFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ExercisePriceRangeFiveMember" name="ExercisePriceRangeFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NonVestedRestrictedStockAwardsMember" name="NonVestedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TwoThousandEighteenEquityIncentivePlanMember" name="TwoThousandEighteenEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TwoThousandTwentyInducementIncentivePlanMember" name="TwoThousandTwentyInducementIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_RestrictedStockAndRestrictedStockUnitsRSUMember" name="RestrictedStockAndRestrictedStockUnitsRSUMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_PerformanceRestrictedStockUnitsMember" name="PerformanceRestrictedStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_FourEqualTranchesMember" name="FourEqualTranchesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ShareBasedCompensationAwardTrancheFourMember" name="ShareBasedCompensationAwardTrancheFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_NumberOfEqualTranches" name="NumberOfEqualTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_WeightedAveragePriceNumberOfDaysTrailing" name="WeightedAveragePriceNumberOfDaysTrailing" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsClosingPrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsClosingPrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="stim_DefinedContributionPlansName" name="DefinedContributionPlansName" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DeferredTaxAssetsInterestExpense" name="DeferredTaxAssetsInterestExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_DeferredTaxAssetsLeaseLiability" name="DeferredTaxAssetsLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_DeferredTaxAssetsCapitalizedStartUpCosts" name="DeferredTaxAssetsCapitalizedStartUpCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_DeferredTaxLiabilitiesRightOfUseAsset" name="DeferredTaxLiabilitiesRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_DeferredTaxAssetsOperatingLossCarryforwardsResearchAndDevelopmentCredits" name="DeferredTaxAssetsOperatingLossCarryforwardsResearchAndDevelopmentCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="stim_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OperatingLossCarryforwardsExpiration" name="OperatingLossCarryforwardsExpiration" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ReimbursementRevenuePerTreatment" name="ReimbursementRevenuePerTreatment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="stim_UpfrontPaymentMember" name="UpfrontPaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_MilestonePaymentMember" name="MilestonePaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TeijinPharmaLimitedMember" name="TeijinPharmaLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_DistributionAgreementMember" name="DistributionAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_AgreementExpiryDate" name="AgreementExpiryDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ExtendedTermOfAgreement" name="ExtendedTermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" name="RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_DistributionAgreementsWithRenewalDescription" name="DistributionAgreementsWithRenewalDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="stim_ProductCategoryMember" name="ProductCategoryMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_NeuroStarAdvancedTherapySystemMember" name="NeuroStarAdvancedTherapySystemMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TreatmentSessionsMember" name="TreatmentSessionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_OtherProductMember" name="OtherProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_ReductionInForceMember" name="ReductionInForceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="stim_TransitionSeparationAgreementMember" name="TransitionSeparationAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
