MemoryILongtermmemoryEncoding(PPT-36).ppt
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MemoryILongtermmemoryEncoding(PPT-36).ppt
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MemoryILong-termmemory&Encoding,AretheremultipleLTMmemorysystems?
Howdoyoulearnanewskill?
Howdoyoulearnanewfact?
Howaboutlearningaboutanevent?
Isthereonelong-termmemory(LTM)systemforthesetypesofknowledgeoraretheremultipleLTMsystems?
ATaxonomyofMemorySystems,LONGTERMMEMORY,EXPLICIT(declarative),IMPLICIT(non-declarative),SEMANTIC(facts),EPISODIC(events),PROCEDURAL(skills&habits),PRIMING(perceptual,conceptual),MedialTemporalLobe,ASSOCIATIVELEARNING(classical&operantconditioning),Cortex,Striatum,Amydala/Cerebellum,Implicitandexplicitmemory,Implicitmemory:
pastexperiencesinfluenceperceptions,thoughts&actionswithoutawarenessthatanyinformationfrompastisaccessedExplicitmemory:
consciousaccesstoinfofromthepast(“Irememberthat.”)-involvesconsciousrecollection,Explicit&ImplicitMemoryTestsLookatthefollowingwords.Iwilltestyourmemoryforthesewordsinvariousways.,MemoryTest,Explicittestofmemory:
recallWritedownthewordsyourememberfromthelistintheearlierslideImplicittestofmemory:
wordfragmentcompletionOnthenextslide,youwillseesomewordsmissingletters,some“wordfragments”andsomeanagrams.Guesswhateachwordmightbe.,ImplicitMemoryTasks,Word-fragmentcompletionisanimplicitmemorytask.Fragmentsare(often)completedwithwordspreviouslystudiedintheabsenceofanexplicitinstructiontorememberthewordAmnesiacsoftenshowedsparedimplicitmemorydissociationsuggestdifferentsystemsforimplicitandexplicitmemorysystems,Implicitvs.ExplicitMemory,Graf,Squire,&Mandler(1984):
Studywords:
cheese,house,Explicitmemorytest:
cuedrecall.Completefragmenttoawordfromstudylist:
ch____Implicitmemorytest:
wordstemcompletion.Completefragmenttoformanyword:
ch____,Word-stemcompletionsparedinamnesiacs,Grafetal.(1984).,Amnesia,Sources,Blowtohead,ConcussionKorsakoffsyndrome(severevit.B1deficiency)AlzheimersDamagetohippocampus,thalamicstructuresECT(electroconvulsiveshocktherapy)Midazolam:
artificallyinducedamnesia,Amnesia,Types:
Retrograde:
cannotrememberoldmemoriesAnterograde:
cannotformnewepisodicmemories,Retrogradeamnesia,Temporalgradient:
earlymemoriesarebetterrememberedthanmemoriesbeforetrauma(Ribotslaw)Recentlyformedmemoriescontinuetoundergoneurologicalchange:
memoryconsolidationRetrogradeamnesiaoftenbecomeslesssevereovertimeMostremotememoriesarelikelytoreturnfirstDoesnotaffectoverlearnedinformation(e.g.skills),TemporalGradient,Memoryfordiaryentriesfromretrogradeamnesic,(Butters&Cermak,1986),AnterogradeAmnesia,InabilitytoacquirenewinformationThinkofmovie“memento”Doesnotaffectshort-termmemoryDoesnotaffectgeneralknowledgefromthepastBut,itisdifficulttolearnnewfactsAffectsmemoryregardlessofmodality(visual,auditory,tactile,etc).SparesskilledperformanceHyper-specificmemoryforthoseskillsthatarelearnedafteronsetlearningisexpressedonlyincontextinwhichitwasencoded,FamousAnterogradeAmnesiac:
HM,SevereepilepsyTreatedwithsurgerytobilaterallyremovemedialtemporallobes,includinghippocampusOperation9/1953,27yearsoldANPRsegmentonHM,H.M,Generalknowledgeintactbut“stuckintime”.Didnotlearnwordsintroducedafter1953:
“jacuzzi”,“granola”,“flower-child”WasabletoformsomememoriesInitiallycouldntlearnhowtogettohisnewhome.TookmanyyearstolearnhisownhouseCouldlearntomirrorreversereadandmirrortrace,HMabletomirrortrace,Milner,1965,improvementinH.M.formirrortracingtask(withoutconsciousrecollectionofprevioustrainingepisodes)themedialtemporallobesarenotnecessaryforalltypesoflong-termmemory.,Canamnesicsacquireanynewknowledge?
Declarativememory(memoryforinformation/knowledge,e.g.episodic&semanticmemory)impairedProceduralmemory(e.g.,howtorideabike)yesImplicitmemories(usingpastinformationpossiblywithoutbeingawareofit)yes,Learninganewskill:
mirror-reversereading,Amnesicscanlearntomirror-reversereadandaresensitivetorepetitions,Spared(implicit)learninginanterogradeamnesia,Claparedestudy(1911).PatientneverrememberedhavingmetClaparede(doctor)beforeClaparadeoffershandshakeswithpinprickNexttime,noexplicitmemoryofevent(ordoctor)Still,patientrefusestoshakehandsandoffersexplanation:
“sometimespinsarehiddeninpeopleshands”Korsakoffpatients&TriviaquestionsGivenfeedback,thenretested.Noconsciousmemoryforitemsbutbetterperformance.“Ireadaboutitsomewhere”.(Schacter,Tulving&Wang,1981).,Encoding&RetrievalEffects,LevelsofProcessing,Levelsofprocessingeffect:
Deeperlevelsofprocessing(e.g.,emphasizingmeaning)tendtoleadtobetterrecall.,(Craik&Lockhart,1972),EncodingSpecificityPrinciple,RecollectionperformancedependsnotonlyonhowtheinformationwasencodedbutalsohowthewaytheinformationisretrievedattestEncodingspecificityprinciple:
recollectiondepend
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