Introduction to Cognitive Psychology - Department of Psychological ...
Introduction to Cognitive Psychology - Department of Psychological ...
Introduction to Cognitive Psychology - Department of Psychological ...
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Pr<strong>of</strong>. Greg Francis 8/16/11Free Recall Serial Position Curve!! Given almost any list <strong>of</strong> items!! Subjects remember the first and last few itemsbest (free recall, not immediate serial recall)1Probability <strong>of</strong> recall0.8RECENCYPRIMACY0.60.40.201 2 3 4 5 6 7Position in listPurdue UniversitySerial position curve!! The effect <strong>of</strong> position is robust across many types <strong>of</strong> lists!! words!! letters!! numbers!! pictures…!! Here’s theCogLab data!! Demo!! (171 subjects)Percent correct"Position in list"Purdue UniversitySerial position curve!! In some situations the serial position curve canbe explained by different properties <strong>of</strong> STM andLTMProbability <strong>of</strong> recall10.80.60.40.20PRIMACY:Use LTMRECENCY:Use STMNEITHER LTM NOR STM1 2 3 4 5 6 7Position in listPurdue UniversityConclusions!! Short Term Memory (STM)!! Long Term Memory (LTM)!! STM / LTM distinction is one <strong>of</strong> thestrongest conclusions <strong>of</strong> cognitivepsychology!! Accounts for quite a bit <strong>of</strong> data!! Many details are unresolvedPurdue UniversityNext time!! Expansion <strong>of</strong> STM in<strong>to</strong>!! Working memory!! central executive!! phonological s<strong>to</strong>re!! visuo -spatial sketchpad!! CogLab on Sternberg search due!!! Why there is a gate at the first floor stairway inthe Psych building.Purdue UniversityPSY 200: Intro. <strong>to</strong> <strong>Cognitive</strong> <strong>Psychology</strong> 4
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