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Lecture 4

PSY270H5 Lecture 4: ShortTermMemory.pdf


Department
Psychology
Course Code
PSY270H5
Professor
Strang Burton
Lecture
4

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Attentiondiscussion
Visualsearch
lookingforanobjectinaparticularlocation
wearelookingforobjectfeatures
lookingforafriend
friendhasblondehairwearingblueshirt
visualsearchyouarelookingfroblondehairandblueshirt(theyahvetooccur
inthesamelocation)
combinationoffeaturesinonelocation
lab:objectshapesandcolor
diffshapessamecolor
diffshapesandcolor
agreencirclenothardtofind
manycircleswithonegreencirclesinthemiddle(greencirclesharescolorandshapesso
itmakesithardertolook)wecan'tlookforjustsomethingthatisgreenorsomethingthatis
acirclewehavetolookforbothinone
Typeofsearch
featuresearch:nofeaturesharedbetweenthetargetandthedistractertheonecircle
conjunctionsearchtargetsharesafeatureswiththedistractersoyouhavetospecifically
lookforsomethingthemanycirclesone
measurementistheRTdependingontheXvariables
graph:conjunctionsearcherstakeslongerthanfeaturesearches
featuresearches:RTisconstantregardlessofdistractions
conjunctionsearches:RTisdependsonthedistractions
conjunctionsearchesareserial
featuresearchesareparallel
Featureintegrationtheory
howwelookforobjectsinafield
2stages
Preattentive
lookforitemanditjumpsout:correspondstofeatures(parallel)theydon't
requireattentionifyoucanidentifyyoutargetbylookingatjustonefeatureit
wouldstandoutwithoutattention
Focusattentionstage
combinefeaturesinonelocationcorrespondstoserialrequiresattention
takesmoretime..

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MEMORY
Whatcanweputinmemory?
Howdoesitwork?howdoweretrieveandencodethings?
doweretrieveinfoserially?
dowehavediffmemoryandaretheyindependent?
dowehaveamemorysystemthatcandomultiplethings?
connectionbetweenmemoryandattention
Whatdowewanttoknowaboutmemory?
limitingfactors(capacityandduration)
typesofthingsitcanhold
howdoweencodeandretrieveitemsintoandfrommemory?
Classicmodel
Atkinshiffrin
MULTISTOREMODEL
structuralmodel
serialbcinfostartsinsensory>STLTmemory
SENSORYMEMORYREVIEW
limited:holdsbasicsenseinfoforlimitedtime
structureofsensorymemory
holdsbasicsensoryinfo
differentstoresforallsenses
AttentionisusedtoprocessinfofromsensorytoSTmemory
Capacity:912itemsduration30sec
SHORTTERMMEMORY
limitedcapacitystore
holdsinfoforrelativelylongtime
LIMITINGFACTORS
durationisbriefifthereisnorehearsal
w/orehearsalitlastsonlycoupleofseconds
rehearsalallowstokeepinfoinSTMitisalsotheprocessoftransferringinfofromSTMto
LTM
CAPACITYofSTMis7+/2(MIller)
CIANFLUSAKLM
moremeaningfulitemscanbeaccessedfromLTMthanwecanremembermore
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