Introduction to Cognitive Psychology - Department of Psychological ...

Prof. Greg Francis 8/16/11Working memoryPSY 200Greg FrancisModal Model of Memory!! Atkinson & Shiffrin (1968)!! Today we focus on the Short-term store (Short termmemory)Lecture 16Why there is a gate at the first floorstairway in the Psych building.Purdue UniversityPurdue UniversitySearch of memory!! How is memory searched?!! Sternberg hypothesized three types of searches!! Explore by varying the number of items in memory set5 3 2 9(similar to visual search experiments)!! measure reaction time!!Sternberg (1969)5 3 2 95 3 2 9Purdue University8NOTypes of searches!! (1) parallel: target item is compared to all the items inmemory at the same timeNO!! the answer (yes or no) is returned after all items have beenchecked8 8 8 8885 3 2 98 8 8 88Purdue UniversityTypes of searches!! (1) parallel: target item is compared to all the items inmemory at the same timeYES!! the answer (yes or no) is returned after all items have beenchecked3 3 3 3335 3 2 93 3 3 33Purdue UniversityReaction time isthe same for ayes response!! If parallel searchMemory search!! number of items doesnot matter!! Yes and No responsesare both flatReaction timeSet sizePurdue UniversityPSY 200: Intro. to Cognitive Psychology 1