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1、©2001NaturePublishingGrouphttp://neurosci.nature.comarticlesAcriticalperiodforrighthemisphererecruitmentinAmericanSignLanguageprocessingAaronJ.Newman1,DaphneBavelier2,DavidCorina3,PeterJezzard4andHelenJ.Neville11DepartmentofPsychology,1227UniversityofOregon,Eugene,Oregon97403-1227,USA2Dept.ofBrain
2、andCognitiveSciences,UniversityofRochester,Rochester,NewYork14627-0268,USA3DepartmentofPsychology,135GuthrieHall,UniversityofWashington,Seattle,Washington98195-1525,USA4FMRIBCentre,JohnRadcliffeHospital,Headington,Oxford,UKCorrespondenceshouldbeaddressedtoA.J.N.(anewman@braindev.uoregon.edu)Publis
3、hedonline:26November2001,DOI:10.1038/nn775SignedlanguagessuchasAmericanSignLanguage(ASL)arenaturallanguagesthatareformallysimilartospokenlanguages,andthuspresentanopportunitytoexaminetheeffectsoflanguagestructureandmodalityontheneuralorganizationforlanguage.Nativelearnersofspokenlanguagesshowpredo
4、minantlyleft-lateralizedpatternsofneuralactivationforlanguageprocessing,whereasnativelearnersofASLshowextensiverighthemisphere(RH)andLHactivation.WedemonstratethattheRHangulargyrusisactiveduringASLprocessingonlyinnativesigners(hearing,ASL-Englishbilinguals)butnotinthosewhoacquiredASLafterpuberty(h
5、earing,nativeEnglishspeakers).Thisisthefirstdemonstrationofa‘sensitive’or‘critical’periodforlanguageinanRHstructure.Thishasimplicationsforlanguageacquisitionandforunderstandingage-relatedchangesinneuroplasticitymoregenerally.©2001NaturePublishingGrouphttp://neurosci.nature.comLanguageisacentraland
6、integralpartofourpersonalandsocialotheravisual-manual(signed)language.Inhearingpersonswholives.Adeeperunderstandingbothoflanguageandoftheprinci-wereborntodeafparentsandlearnedbothASLandEnglishasplesgoverningbrainorganizationcancomefrominvestigatingthenativelanguages,readingEnglishprimarilyactivate
7、sclassicallan-degreetowhichlanguage-relevantneuralsystemsmaybebiolog-guageregionsoftheLH,whereasviewingASLsentencesactivatesicallyconstrained,theextenttowhichtheyaresusceptibletomod-similarLHregionsandanextensive
