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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
