affirmative views on critical period hypothesis and problems of cph studies

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1、AffirmativeviewsonCriticalPeriodHypothesisandProblemsofCPHStudies　　【Abstract】CriticalPeriodHypothesis（CPH）wasfirstintroducedtosecondlanguageacquisitionbyLennebergin1967.Thenitarousedmanyscholars’attention.Therearebothaffirmativeandnegativeviews.　　【Keyword

2、s】CriticalPeriodHypothesis；SecondLanguageAcquisition；Affirmativeviews；problems　　1.Researchers’StudiesonCPHinSLA　　Johnson&Newport’s（1989）researchexploredthepracticalskillsingrammarof46nativeKoreanandChinesespeakerswhoarrivedinAmericafrom3to39.Theyhadlearne

3、dEnglishforaperiodfrom3to26years.TheresultrevealedthatsuccessinacquiringgrammaticalproficiencywasalmostpredictedbytheagewhentheyfirstlearnEnglishandtheproficiencyseemedtodeclineattheageof8yearsold.Thisstudyappearstobewidelycitedasoneofthebestevidenceofthe

4、CPHinSLA.　　BirdsongandMolis（2001）conductedareplicationofJohnsonandNewport（1989）.Theprofilesof61nativespeakersofSpanish，29ofwhomhadarrivedintheU.S.byage16（earlyarrivals）and32ofwhomhadarrivedage17orabove（latearrivals）.Fortheearlyarrivals，theaveragelengthofr

5、esidencewas12.2yearswhereastheaveragelengthofresidenceforlategroupwas10.5.BirdsongandMolisfiguredoutthattherewasastronginverserelationship（-.69，p<.0001）betweenageofarrivalandtestscoresamongthelatearrivals.Ontheotherhand，therewasnosignificantcorrelationbet

6、weenageofarrivalandtestscoresinearlyarrivals.　　Dekeyser（2000）hascarriedoutaresearchwhichhasbeenintendedtotestthefundamentaldifferencehypothesis.ThroughastudyofadultHungarian-speakingimmigrants，hehasdemonstratedanexplanationconcerningexceptionswhichhavefai

7、ledtoresonatewithwhatcriticalperiodhypothesishassuggested.Moreover，Dekeyser（2000）hasfurtheredshedlightonthedifferentlearningmechanismsfeaturingyoungandadultsecondlanguagelearners，whichcanbeattributedtothepowerofcriticalhypothesis　　Singletonhasshowndoubtsc

8、oncerningcriticalperiodhypothesisinrealearnest.InthisveryarticlewrittenbySingleton（2001），theauthordemonstratesarelativelydetailedreviewofstudieswithregardtoagefactorsonthebasisofitshistoricaldevelopment.Inthesamevei