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<!-- DFS ActiveDisclosure(SM) XBRL Schema Document - http://www.dfsco.com/financial-services/ -->
<!-- Creation Date      : 2019-03-04T21:49:00.8017931+00:00 -->
<!-- Version            : 3.3.6989.14284 -->
<!-- Package ID         : c129e0d4ed3f42738a117ff6e3cfc8e3 -->
<!-- Copyright (c) 2019 Donnelley Financial, LLC. All Rights Reserved. -->
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  <element id="stim_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ComputersAndSoftwareMember" name="ComputersAndSoftwareMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_LaboratoryAndOfficeEquipmentMember" name="LaboratoryAndOfficeEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_DevicesInRentalAgreementProgramMember" name="DevicesInRentalAgreementProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ProductWarrantyPeriod" name="ProductWarrantyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_OperatingLossCarryforwardsBeginToExpireYear" name="OperatingLossCarryforwardsBeginToExpireYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_MedicalDeviceTaxSuspensionPeriod" name="MedicalDeviceTaxSuspensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_AccountingStandardsUpdate201612Member" name="AccountingStandardsUpdate201612Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_OperatingLeasesExpirationYear" name="OperatingLeasesExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_FairValueMeasurementInputConvertiblePreferredStockOfWarrantLiability" name="FairValueMeasurementInputConvertiblePreferredStockOfWarrantLiability" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_FairValueMeasurementInputRemainingTerm" name="FairValueMeasurementInputRemainingTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_MeasurementInputEstimatedFairValueOfConvertiblePreferredStockMember" name="MeasurementInputEstimatedFairValueOfConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <element id="stim_TermBLoanMember" name="TermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_TermCLoanMember" name="TermCLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_TwentyFiveMillionCreditFacilityMember" name="TwentyFiveMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" name="NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_PercentageOfWarrantIssuedToTrancheBorrowed" name="PercentageOfWarrantIssuedToTrancheBorrowed" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_TrailingTwelveMonthRevenuesToBeAchievedForBorrowingAdditionalAvailabilityUnderLineOfCreditFacility" name="TrailingTwelveMonthRevenuesToBeAchievedForBorrowingAdditionalAvailabilityUnderLineOfCreditFacility" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_LongTermDebtPercentageBearingVariableInterestRateFloor" name="LongTermDebtPercentageBearingVariableInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityAdditionalAvailabilityUponAchievementOfTrailingTwelveMonthRevenues" name="LineOfCreditFacilityAdditionalAvailabilityUponAchievementOfTrailingTwelveMonthRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_LineOfCreditFacilityInterestOnlyPeriod" name="LineOfCreditFacilityInterestOnlyPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityAmortizationPeriodWithoutInterestOnlyPeriodExtension" name="LineOfCreditFacilityAmortizationPeriodWithoutInterestOnlyPeriodExtension" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityInterestOnlyPeriodExtensionPeriodUponAchievementOfRevenues" name="LineOfCreditFacilityInterestOnlyPeriodExtensionPeriodUponAchievementOfRevenues" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" name="LineOfCreditFacilityInterestOnlyPeriodExtensionUponAchievementOfRevenues" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityAmortizationPeriodUponExtensionOfInterestOnlyPeriod" name="LineOfCreditFacilityAmortizationPeriodUponExtensionOfInterestOnlyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_WarrantsExpirationPeriod" name="WarrantsExpirationPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" name="LineOfCreditFacilityIncreaseInFinalPaymentFeesPercentageUponExtensionInterestOnlyPeriods" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityPrepaymentFeesPercentage" name="LineOfCreditFacilityPrepaymentFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_LineOfCreditFacilityPercentageOfForecastedRevenueToBeAchievedInFinancialMaintenanceCovenant" name="LineOfCreditFacilityPercentageOfForecastedRevenueToBeAchievedInFinancialMaintenanceCovenant" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_TermALoanAndTermBLoanMember" name="TermALoanAndTermBLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_LineOfCreditFacilityFinalPaymentFeesPercentage" name="LineOfCreditFacilityFinalPaymentFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_DebtInstrumentFinalPaymentFee" name="DebtInstrumentFinalPaymentFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_StockholdersDeficitLineItems" name="StockholdersDeficitLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_StockholdersDeficitTable" name="StockholdersDeficitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesDConvertiblePreferredStockMember" name="SeriesDConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesEConvertiblePreferredStockMember" name="SeriesEConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesFConvertiblePreferredStockMember" name="SeriesFConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesGConvertiblePreferredStockMember" name="SeriesGConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesATwoConvertiblePreferredStockMember" name="SeriesATwoConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesBConvertiblePreferredStockMember" name="SeriesBConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesCConvertiblePreferredStockMember" name="SeriesCConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_JuniorSecuritiesMember" name="JuniorSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SharesOfCommonStockReservedForIssuanceAbstract" name="SharesOfCommonStockReservedForIssuanceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_CommonStockSharesIssuedAndReservedForFutureIssuance" name="CommonStockSharesIssuedAndReservedForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_SeriesEConvertiblePreferredStockWarrantsMember" name="SeriesEConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesFConvertiblePreferredStockWarrantsMember" name="SeriesFConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_CommonStockWarrantsMember" name="CommonStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesAOneConvertiblePreferredStockMember" name="SeriesAOneConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ConversionOfPreferredStockToCommonStockConversionRatio" name="ConversionOfPreferredStockToCommonStockConversionRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_AdditionalTemporaryEquityLiquidationPreferencePerShare" name="AdditionalTemporaryEquityLiquidationPreferencePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_AdditionalTemporaryEquityLiquidationPreferencePerShareDue" name="AdditionalTemporaryEquityLiquidationPreferencePerShareDue" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_ExercisePriceRangeOneMember" name="ExercisePriceRangeOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ExercisePriceRangeTwoMember" name="ExercisePriceRangeTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ExercisePriceRangeThreeMember" name="ExercisePriceRangeThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ExercisePriceRangeFourMember" name="ExercisePriceRangeFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ExercisePriceRangeFiveMember" name="ExercisePriceRangeFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesFConvertiblePreferredStockWarrantsTwoMember" name="SeriesFConvertiblePreferredStockWarrantsTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesFConvertiblePreferredStockWarrantsThreeMember" name="SeriesFConvertiblePreferredStockWarrantsThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_SeriesFConvertiblePreferredStockWarrantsFourMember" name="SeriesFConvertiblePreferredStockWarrantsFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ConvertiblePreferredStockWarrantsMember" name="ConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_NonVestedRestrictedStockAwardsMember" name="NonVestedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_TwoThousandEighteenEquityIncentivePlanMember" name="TwoThousandEighteenEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_TwoThousandThreeStockIncentivePlanMember" name="TwoThousandThreeStockIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_RestrictedStockAndRestrictedStockUnitsRSUMember" name="RestrictedStockAndRestrictedStockUnitsRSUMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodWeightedAverageGrantDateFairValueOfUnderlyingCommonStock" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedGrantDateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAutomaticAnnualIncreasesInShareReserve" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_DeferredTaxAssetsInterestExpense" name="DeferredTaxAssetsInterestExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_DeferredTaxAssetsCapitalizedStartUpCosts" name="DeferredTaxAssetsCapitalizedStartUpCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_DeferredTaxAssetsOperatingLossCarryforwardsResearchAndDevelopmentCredits" name="DeferredTaxAssetsOperatingLossCarryforwardsResearchAndDevelopmentCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_OperatingLossCarryforwardsExpiration" name="OperatingLossCarryforwardsExpiration" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_DistributionAgreementPeriod" name="DistributionAgreementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_UpfrontPaymentMember" name="UpfrontPaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_MilestonePaymentMember" name="MilestonePaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_TeijinPharmaLimitedMember" name="TeijinPharmaLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_DistributionAgreementMember" name="DistributionAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_AgreementExpiryDate" name="AgreementExpiryDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_ExtendedTermOfAgreement" name="ExtendedTermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" name="RelatedPartyPurchasedPercentageOfSalesForecastsOverAgreementTerm" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_DistributionAgreementRenewalPeriod" name="DistributionAgreementRenewalPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_DistributionAgreementsWithRenewalDescription" name="DistributionAgreementsWithRenewalDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_SupplementaryFinancialInformationLineItems" name="SupplementaryFinancialInformationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</schema>
