Some Neurolinguistic Evidence Regarding Variation in Interlanguage Use the Status of the 'S

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SomeNeurolinguisticEvidenceRegardingVariationinInterlanguageUse:theStatusofthe’SwitchMechanism’

MarjoriePerlmanLorchAppliedLinguistics,BirkbeckCollegeUniversityofLondon

ToAppearin,L.Eubank,L.Selinker,andM.Sharwood-Smith(Eds.),TheCurrentStateofInterlanguageStudies.Amsterdam:Benjamins,inpress.

Address:AppliedLinguistics,BirkbeckCollege,43GordonSquare,LondonWC1HOPDEnglande-mail:m.lorch@apli.bbk.ac.ukSomeNeurolinguisticEvidenceRegardingVariationinInterlanguageUse:theStatusofthe’SwitchMechanism’

MarjoriePerlmanLorchBirkbeckCollege,UniversityofLondon

IntroductionIninterculturalsituations,Interlanguage(IL)speakersmayswitchbetweentheirnativelanguage(NL)andILandbetweenvariousILsdependingoncontextandavarietyofotherfactors(e.g.,Selinker,1992).Littlediscussionhasappearedintheliteraturewhichaddressesthecognitiveprocessesthatsubservethisbehaviour.EvidencefrombilingualaphasiaandneurolinguisticresearchcancontributetothewayinwhichthecognitivedescriptionoftheabilitytoswitchbetweendifferentlanguagesystemsinspokenproductionmustbedevelopedinordertocontributetoacomprehensiveaccountofILperformance.

Theterm’switching’isappliedhereinitsbroadestsense.Thenotionofcode-switchingisusedtodescribetheperformanceofaspeaker(orspeakers)whoshiftsbetweentheirvariouslanguagesandILsinlisteningandspeaking,alternatingbetweencodesattheclause,sentenceordiscourselevelorinresponsetosituationalorpsycholinguisticconstraints.

’Code-switching’iscommonlyemployedinthebilingualismliteraturetodescribespeakersandsituationsinwhichthereis3mixingorswitchingbetweenmorethanonelanguage(e.g.Grosjean,1982).Sociolinguistshavedemonstratedtherangeofsocialandsituationalvariableswhichaffectcode-switchingbehaviourandtheconcomitantlinguisticconstraintsonproducingutteranceswithlanguagemixing(seeNishimura,1986;Gardner-Chloros,1995andreferencestherein).SwitchingandmixingoflanguagesininterlingualsituationsmaybeduetovariabilityinTL(targetlanguage)competencereflectedinre-emergenceofproductionoffossilizedformsincertaincontextsordiscoursedomains(Selinker,1992).

Theoriginoftheconceptofamechanismforswitchingbetweenlanguagesystemsliesintherealmofneurolinguistics.1TheneurologistWilderPenfield(1959)providedthemodernformulationoftheideaofa"curiouslyeffectiveautomaticswitchthatallowseachindividualtoturnfromonelanguagetoanother.WhatIhavereferredtoasa’switch’wouldbecalled,byexperimentalphysiologists,aconditionedreflex.WhenchildoradultturnstoanindividualwhospeaksonlyEnglish,hespeaksonlyEnglish,and,turningtoamanwhospeaksFrenchandhearingawordofFrench,theconditioningsignalturnstheswitchoverandonlyFrenchwordsseemtocometomind."(p.253)

Penfieldmakesspecificneurolinguisticclaims,statingthat"the[linguistic]mechanismthatisdevelopedinthebrainisthesamewhetherone,twoormorelanguagesarelearned...thecortico-thalamicspeechmechanismservesall...languages[knowntothespeaker]andthereisnoevidenceofanatomicalseparation..."(1959,p.253).

ThisneurolinguisticissuehasobviousimplicationsforpatternsofbilingualaphasiaasPenfieldhimselfpointsout.Hestatesthatdescriptionsintheliteraturedescribingbilingualaphasics4wholostonelanguageandpreservedanotherastheresultofastrokemusthavebeeninadequatelystudiedorbeduetopsychological(i.e.emotionalratherthancognitive)reasonswhyonelanguagewaspreferredduringrecovery.2

Penfield’sshiftfromaneurologicaltopsychologicalaccountfortheabilityorinabilitytoswitchbetweenlanguagesisunsatisfactory.Detaileddescriptionsofbilingualaphasiahavebeenpublishedthroughoutthiscentury(seeParadis,1983)andamajormonographonthesubjectwasproducedbyAlbertandOblerin1978.Theseauthorsdetailedthevarietyofpatternsexhibitedbypolyglotaphasicswithrespecttothelanguageproductionandcomprehensionabilitiesintheirtwo(ormore)languages.Morerigorouslyinvestigatedrecentcasesofbilingualaphasiahavecontinuedtoshowpatternsofdifferentialrecoveryofonelanguageoveranother.Acaseinpointwillbediscussedindetailbelow.

Bilingualspeakerswhosufferneurologicalimpairmenttodominantperisylviancortexhaveimpairedlanguagefunctionswhicharemanifestinavarietyofways.OfthevariouspossibilitiesforpatternsofimpairmentinLgsandIls,mostofthelogicallypossiblepermutationshavebeendescribed.Thesedescriptionsdocumentpatternsofimpairmentwherethevariouslanguagesareaffectedequallyindegreeandkind,andthosewherethelanguagesaredifferentiallyaffected:betterorselectiverecoveryofoneofthelanguages,oreventwodifferentaphasiatypes(AlbertandObler,1978;Paradis,1977;1983).