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>essor Greg Francis 1/6/11Pro<strong>to</strong>types!! In pro<strong>to</strong>type theory it is possible for an object <strong>to</strong>be “more” or “less” a certain concept!! Consider the concept “c<strong>of</strong>fee cup”!!and variations (some are “cup-ier” than others)Pro<strong>to</strong>types!! In pro<strong>to</strong>type theory it is possible for an object <strong>to</strong>be “more” or “less” a certain concept!! Consider the concept “c<strong>of</strong>fee cup”!!and variations (some are “cup-ier” than others)Purdue UniversityPurdue UniversityPro<strong>to</strong>types!! Lots <strong>of</strong> experiments suggest the role <strong>of</strong>pro<strong>to</strong>types!!Posner & Keele (1968): learning category names forrandom dot patterns!!Discriminate two sets <strong>of</strong> random dot patterns!!Each pattern is a variation <strong>of</strong> one <strong>of</strong> two pro<strong>to</strong>typepatterns!! Pro<strong>to</strong>typesAPro<strong>to</strong>typesBPurdue UniversityPurdue UniversityPro<strong>to</strong>types!! variations are made by moving some <strong>of</strong> the dotsvariant <strong>of</strong> Avariant <strong>of</strong> BPro<strong>to</strong>types!! The key test is done after subjects learn <strong>to</strong> classify thevariants!! reaction time for judgment is recorded for stimuli they have neverseen before»! new variants»! the pro<strong>to</strong>types!! reaction time is faster for the pro<strong>to</strong>types!! which suggests that the mental representation <strong>of</strong> the categories(concepts) are built <strong>to</strong> favor the pro<strong>to</strong>type <strong>of</strong> the category!! Look at CogLab data!! subjects learn <strong>to</strong> classify many different variants!!they never see the pro<strong>to</strong>types themselvesPurdue UniversityPurdue UniversityPSY 200: Intro. <strong>to</strong> <strong>Cognitive</strong> <strong>Psychology</strong> 3