<?xml version="1.0" encoding="us-ascii"?>
<!-- DFS ActiveDisclosure(SM) XBRL Schema Document - http://www.dfsco.com/financial-services/ -->
<!-- Creation Date      : 2018-11-05T22:51:06.1663360+00:00 -->
<!-- Version            : 3.1.6852.22116 -->
<!-- Package ID         : 1e1f389b743c4e89b5fce1ef9a81c103 -->
<!-- Copyright (c) 2018 Donnelley Financial, LLC. All Rights Reserved. -->
<schema xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:us-types="http://fasb.org/us-types/2018-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2018-01-31" xmlns:srt-types="http://fasb.org/srt-types/2018-01-31" xmlns:naics="http://xbrl.sec.gov/naics/2017-01-31" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:stim="http://www.neurostar.com/20180930" xmlns:srt="http://fasb.org/srt/2018-01-31" xmlns:us-gaap="http://fasb.org/us-gaap/2018-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2018-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:country="http://xbrl.sec.gov/country/2017-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2018-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.neurostar.com/20180930" xmlns="http://www.w3.org/2001/XMLSchema">
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/linkbase" />
  <import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt" />
  <import schemaLocation="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd" namespace="http://xbrl.sec.gov/dei/2018-01-31" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd" namespace="http://fasb.org/us-gaap/2018-01-31" />
  <import schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd" namespace="http://fasb.org/srt/2018-01-31" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-types-2018-01-31.xsd" namespace="http://fasb.org/us-types/2018-01-31" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/numeric" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/non-numeric" />
  <import schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-types-2018-01-31.xsd" namespace="http://fasb.org/srt-types/2018-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" namespace="http://xbrl.sec.gov/country/2017-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd" namespace="http://xbrl.sec.gov/currency/2017-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd" namespace="http://xbrl.sec.gov/exch/2018-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" namespace="http://xbrl.sec.gov/invest/2013-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" namespace="http://xbrl.sec.gov/naics/2017-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" namespace="http://xbrl.sec.gov/sic/2011-01-31" />
  <import schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" namespace="http://xbrl.sec.gov/stpr/2018-01-31" />
  <annotation>
    <appinfo>
      <link:roleType id="TemplateLink" roleURI="http://www.neurostar.com/20180930/role/TemplateLink" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>00000 - Document - Template Link</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="stim-20180930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:title="Calculation Links, all" xlink:type="simple" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="stim-20180930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:title="Definition Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="stim-20180930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:title="Label Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="stim-20180930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:title="Presentation Links, all" xlink:type="simple" />
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DocumentDocumentAndEntityInformation" id="Role_DocumentDocumentAndEntityInformation">
        <link:definition>100000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementBalanceSheets" id="Role_StatementBalanceSheets">
        <link:definition>100010 - Statement - Balance Sheets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementBalanceSheetsParenthetical" id="Role_StatementBalanceSheetsParenthetical">
        <link:definition>100020 - Statement - Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementStatementsOfOperations" id="Role_StatementStatementsOfOperations">
        <link:definition>100030 - Statement - Statements of Operations</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementStatementOfChangesInConvertiblePreferredStockAndStockholdersEquityDeficit" id="Role_StatementStatementOfChangesInConvertiblePreferredStockAndStockholdersEquityDeficit">
        <link:definition>100040 - Statement - Statement of Changes in Convertible Preferred Stock and Stockholders&apos; Equity (Deficit)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementStatementOfChangesInConvertiblePreferredStockAndStockholdersEquityDeficitParenthetical" id="Role_StatementStatementOfChangesInConvertiblePreferredStockAndStockholdersEquityDeficitParenthetical">
        <link:definition>100050 - Statement - Statement of Changes in Convertible Preferred Stock and Stockholders&apos; Equity (Deficit) (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/StatementStatementsOfCashFlowsUnaudited" id="Role_StatementStatementsOfCashFlowsUnaudited">
        <link:definition>100060 - Statement - Statements of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDescriptionOfBusiness" id="Role_DisclosureDescriptionOfBusiness">
        <link:definition>100070 - Disclosure - Description of Business</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureBasisOfPresentation" id="Role_DisclosureBasisOfPresentation">
        <link:definition>100080 - Disclosure - Basis of Presentation</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies" id="Role_DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>100090 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureRecentAccountingPronouncements" id="Role_DisclosureRecentAccountingPronouncements">
        <link:definition>100100 - Disclosure - Recent Accounting Pronouncements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureFairValueMeasurementAndFinancialInstruments" id="Role_DisclosureFairValueMeasurementAndFinancialInstruments">
        <link:definition>100110 - Disclosure - Fair Value Measurement and Financial Instruments</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccountsReceivable" id="Role_DisclosureAccountsReceivable">
        <link:definition>100120 - Disclosure - Accounts Receivable</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentAndCapitalizedSoftware" id="Role_DisclosurePropertyAndEquipmentAndCapitalizedSoftware">
        <link:definition>100130 - Disclosure - Property and Equipment and Capitalized Software</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccruedExpenses" id="Role_DisclosureAccruedExpenses">
        <link:definition>100140 - Disclosure - Accrued Expenses</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebt" id="Role_DisclosureDebt">
        <link:definition>100150 - Disclosure - Debt</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficit" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficit">
        <link:definition>100160 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureLossPerShare" id="Role_DisclosureLossPerShare">
        <link:definition>100170 - Disclosure - Loss Per Share</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensation" id="Role_DisclosureShareBasedCompensation">
        <link:definition>100180 - Disclosure - Share-based Compensation</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureEmployeeBenefitPlans" id="Role_DisclosureEmployeeBenefitPlans">
        <link:definition>100190 - Disclosure - Employee Benefit Plans</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingencies" id="Role_DisclosureCommitmentsAndContingencies">
        <link:definition>100200 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureGeographicalSegmentInformation" id="Role_DisclosureGeographicalSegmentInformation">
        <link:definition>100210 - Disclosure - Geographical Segment Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureBasisOfPresentationPolicies" id="Role_DisclosureBasisOfPresentationPolicies">
        <link:definition>100220 - Disclosure - Basis of Presentation (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureFairValueMeasurementAndFinancialInstrumentsTables" id="Role_DisclosureFairValueMeasurementAndFinancialInstrumentsTables">
        <link:definition>100230 - Disclosure - Fair Value Measurement and Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccountsReceivableTables" id="Role_DisclosureAccountsReceivableTables">
        <link:definition>100240 - Disclosure - Accounts Receivable (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentAndCapitalizedSoftwareTables" id="Role_DisclosurePropertyAndEquipmentAndCapitalizedSoftwareTables">
        <link:definition>100250 - Disclosure - Property and Equipment and Capitalized Software (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccruedExpensesTables" id="Role_DisclosureAccruedExpensesTables">
        <link:definition>100260 - Disclosure - Accrued Expenses (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebtTables" id="Role_DisclosureDebtTables">
        <link:definition>100270 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficitTables" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficitTables">
        <link:definition>100280 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureLossPerShareTables" id="Role_DisclosureLossPerShareTables">
        <link:definition>100290 - Disclosure - Loss Per Share (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationTables" id="Role_DisclosureShareBasedCompensationTables">
        <link:definition>100300 - Disclosure - Share-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureGeographicalSegmentInformationTables" id="Role_DisclosureGeographicalSegmentInformationTables">
        <link:definition>100310 - Disclosure - Geographical Segment Information (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDescriptionOfBusinessAdditionalInformationDetails" id="Role_DisclosureDescriptionOfBusinessAdditionalInformationDetails">
        <link:definition>100320 - Disclosure - Description of Business - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureBasisOfPresentationAdditionalInformationDetails" id="Role_DisclosureBasisOfPresentationAdditionalInformationDetails">
        <link:definition>100330 - Disclosure - Basis of Presentation - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureRecentAccountingPronouncementsAdditionalInformationDetails" id="Role_DisclosureRecentAccountingPronouncementsAdditionalInformationDetails">
        <link:definition>100340 - Disclosure - Recent Accounting Pronouncements - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureFairValueMeasurementAndFinancialInstrumentsScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentsDetails" id="Role_DisclosureFairValueMeasurementAndFinancialInstrumentsScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentsDetails">
        <link:definition>100350 - Disclosure - Fair Value Measurement and Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureFairValueMeasurementAndFinancialInstrumentsSummaryOfFairValueInputsAndAssumptionsDetails" id="Role_DisclosureFairValueMeasurementAndFinancialInstrumentsSummaryOfFairValueInputsAndAssumptionsDetails">
        <link:definition>100360 - Disclosure - Fair Value Measurement and Financial Instruments - Summary of Fair Value Inputs and Assumptions (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureFairValueMeasurementAndFinancialInstrumentsSummaryOfChangesInInstrumentsMeasuredOnRecurringBasisDetails" id="Role_DisclosureFairValueMeasurementAndFinancialInstrumentsSummaryOfChangesInInstrumentsMeasuredOnRecurringBasisDetails">
        <link:definition>100370 - Disclosure - Fair Value Measurement and Financial Instruments - Summary of Changes in Instruments Measured on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccountsReceivableCompositionOfAccountsReceivableNetDetails" id="Role_DisclosureAccountsReceivableCompositionOfAccountsReceivableNetDetails">
        <link:definition>100380 - Disclosure - Accounts Receivable - Composition of Accounts Receivable, Net (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentAndCapitalizedSoftwareSummaryOfCompositionOfPropertyAndEquipmentNetDetails" id="Role_DisclosurePropertyAndEquipmentAndCapitalizedSoftwareSummaryOfCompositionOfPropertyAndEquipmentNetDetails">
        <link:definition>100390 - Disclosure - Property and Equipment and Capitalized Software - Summary of Composition of Property and Equipment, Net (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentAndCapitalizedSoftwareAdditionalInformationDetails" id="Role_DisclosurePropertyAndEquipmentAndCapitalizedSoftwareAdditionalInformationDetails">
        <link:definition>100400 - Disclosure - Property and Equipment and Capitalized Software - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureAccruedExpensesSummaryOfCompositionOfAccruedExpensesDetails" id="Role_DisclosureAccruedExpensesSummaryOfCompositionOfAccruedExpensesDetails">
        <link:definition>100410 - Disclosure - Accrued Expenses - Summary of Composition of Accrued Expenses (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebtSummaryOfCompositionOfDebtDetails" id="Role_DisclosureDebtSummaryOfCompositionOfDebtDetails">
        <link:definition>100420 - Disclosure - Debt - Summary of Composition of Debt (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebtSummaryOfCompositionOfDebtDetails2" id="Role_DisclosureDebtSummaryOfCompositionOfDebtDetails2">
        <link:definition>100430 - Disclosure - Debt - Summary of Composition of Debt (Details)2</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebtAdditionalInformationDetails" id="Role_DisclosureDebtAdditionalInformationDetails">
        <link:definition>100440 - Disclosure - Debt - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureDebtScheduleOfFuturePrincipalPaymentsDetails" id="Role_DisclosureDebtScheduleOfFuturePrincipalPaymentsDetails">
        <link:definition>100450 - Disclosure - Debt - Schedule of Future Principal Payments (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficitAdditionalInformationDetails" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficitAdditionalInformationDetails">
        <link:definition>100460 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfCommonStockIssuedAndReservedForIssuanceDetails" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfCommonStockIssuedAndReservedForIssuanceDetails">
        <link:definition>100470 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit - Summary of Common Stock Issued and Reserved for Issuance (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfCommonStockIssuedAndReservedForIssuanceParentheticalDetails" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfCommonStockIssuedAndReservedForIssuanceParentheticalDetails">
        <link:definition>100480 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit - Summary of Common Stock Issued and Reserved for Issuance (Parenthetical) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfOutstandingCommonStockWarrantsDetails" id="Role_DisclosureConvertiblePreferredStockAndStockholdersDeficitSummaryOfOutstandingCommonStockWarrantsDetails">
        <link:definition>100490 - Disclosure - Convertible Preferred Stock and Stockholders&apos; Deficit - Summary of Outstanding Common Stock Warrants (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureLossPerShareScheduleOfPotentiallyDilutiveSecuritiesOutstandingExcludedFromDilutedLossPerShareCalculationDetails" id="Role_DisclosureLossPerShareScheduleOfPotentiallyDilutiveSecuritiesOutstandingExcludedFromDilutedLossPerShareCalculationDetails">
        <link:definition>100500 - Disclosure - Loss Per Share - Schedule of Potentially Dilutive Securities Outstanding Excluded from Diluted Loss Per Share Calculation (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationSummaryOfShareBasedCompensationExpenseDetails" id="Role_DisclosureShareBasedCompensationSummaryOfShareBasedCompensationExpenseDetails">
        <link:definition>100510 - Disclosure - Share-Based Compensation - Summary of Share-Based Compensation Expense (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationAdditionalInformationDetails" id="Role_DisclosureShareBasedCompensationAdditionalInformationDetails">
        <link:definition>100520 - Disclosure - Share-Based Compensation - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationSummaryOfStockOptionActivityDetails" id="Role_DisclosureShareBasedCompensationSummaryOfStockOptionActivityDetails">
        <link:definition>100530 - Disclosure - Share-Based Compensation - Summary of Stock Option Activity (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationSummaryOfWeightedAverageInputsAndAssumptionsUsedToEstimateGrantDateFairValueOfStockOptionsDetails" id="Role_DisclosureShareBasedCompensationSummaryOfWeightedAverageInputsAndAssumptionsUsedToEstimateGrantDateFairValueOfStockOptionsDetails">
        <link:definition>100540 - Disclosure - Share-Based Compensation - Summary of Weighted-average Inputs and Assumptions used to Estimate Grant-date Fair Value of Stock Options (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureShareBasedCompensationSummaryOfRestrictedStockAwardAndRestrictedStockUnitActivityDetails" id="Role_DisclosureShareBasedCompensationSummaryOfRestrictedStockAwardAndRestrictedStockUnitActivityDetails">
        <link:definition>100550 - Disclosure - Share-Based Compensation - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureEmployeeBenefitPlansAdditionalInformationDetails" id="Role_DisclosureEmployeeBenefitPlansAdditionalInformationDetails">
        <link:definition>100560 - Disclosure - Employee Benefit Plans - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" id="Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails">
        <link:definition>100570 - Disclosure - Commitments and Contingencies - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureGeographicalSegmentInformationAdditionalInformationDetails" id="Role_DisclosureGeographicalSegmentInformationAdditionalInformationDetails">
        <link:definition>100580 - Disclosure - Geographical Segment Information - Additional Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.neurostar.com/20180930/taxonomy/role/DisclosureGeographicalSegmentInformationSummaryOfRevenueGeneratedInGeographicRegionsForYearsIndicatedDetails" id="Role_DisclosureGeographicalSegmentInformationSummaryOfRevenueGeneratedInGeographicRegionsForYearsIndicatedDetails">
        <link:definition>100590 - Disclosure - Geographical Segment Information - Summary of Revenue Generated in Geographic Regions for Years Indicated (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </appinfo>
  </annotation>
  <element id="stim_AccruedOfFinalPaymentFee" name="AccruedOfFinalPaymentFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_AdjustmentsToAdditionalPaidInCapitalConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrants" name="AdjustmentsToAdditionalPaidInCapitalConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_CostOfRentalUnitsPurchasedByCustomers" name="CostOfRentalUnitsPurchasedByCustomers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_TransferOfInventoryToPropertyAndEquipment" name="TransferOfInventoryToPropertyAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="stim_ConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrant" name="ConversionOfConvertiblePreferredStockWarrantsIntoCommonStockWarrant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_InitialPublicOfferingClosingDate" name="InitialPublicOfferingClosingDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_DescriptionOfBusinessLineItems" name="DescriptionOfBusinessLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_DescriptionOfBusinessTable" name="DescriptionOfBusinessTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_ThirtyFiveMillionCreditFacilityMember" name="ThirtyFiveMillionCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_OxfordFinanceLimitedLiabilityCompanyMember" name="OxfordFinanceLimitedLiabilityCompanyMember" 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_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" />
  <element id="stim_RentalEquipmentMember" name="RentalEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="stim_AccruedResearchAndDevelopmentExpenseCurrent" name="AccruedResearchAndDevelopmentExpenseCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="stim_TermALoanMember" name="TermALoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <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_LongTermDebtPercentageBearingVariableInterestRateFloor" name="LongTermDebtPercentageBearingVariableInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" 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_NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" name="NotificationPeriodToLendersInOrderToBorrowLoanUponAchievingRequiredRevenueMilestone" type="xbrli:durationItemType" 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_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_LineOfCreditFacilityFinalPaymentFeesPercentage" name="LineOfCreditFacilityFinalPaymentFeesPercentage" type="num:percentItemType" 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_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_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_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_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_ConversionOfPreferredStockToCommonStockConversionRatio" name="ConversionOfPreferredStockToCommonStockConversionRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_ClassOfWarrantsOrRightExpirationDate" name="ClassOfWarrantsOrRightExpirationDate" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" 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_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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodToPurchaseSharesOfCommonStock" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodToPurchaseSharesOfCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="stim_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockVestingPeriodNumberOfMonthlyInstallment" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardStockVestingPeriodNumberOfMonthlyInstallment" type="xbrli:integerItemType" 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" />
</schema>
