Introduction to Cognitive Psychology - Department of Psychological ...

Prof. Greg Francis 8/12/11Partial report with masking!! Write down letters from the indicated rowX X X XX X X XX X X XPurdue UniversityMasking!! With the mask you do not have enough time to focusattention on the indicated row!! Iconic memory is so brief (less than a second) that itprobably has little to do with “normal” memory!! Too brief to be useful for many situations (except maybeknowing how to reach for something just after lights go out)!! Other similar systems are more notablePurdue UniversityEchoic memoryEchoic memory!! Other senses have a similar type ofpersistence or sensory memoryASWFHVDEX!! Properties!!Longer duration(seconds)!!Smallercapacity!! Significant forsome memorytasksNumber of lettersavailable5432100 1 2 3 4Delay (seconds)Purdue UniversityPurdue UniversityImmediate serial recall!! After given a list of items!!e.g., digits, letters, words,…!!subject must report them back!!1) no delay (immediate)!!2) in the correct order (serial)!!3) no cues (recall, not recognition)!! Plot percentage correctly recalled againstposition of item in listPurdue UniversitySerial position curve!! Often, subjects recall first and last itemsbestProbability of recall10.80.6 PrimacyRecency0.40.201 2 3 4 5 6 7Position in listPurdue UniversityPSY 200: Intro. to Cognitive Psychology 5