EXAM2classnotes - 00:13:00 Visual Cognition I MODULARITY in the Pattern Recognition System some researchers have proposed that the human brain has

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31/03/2011 00:13:00 Visual Cognition I. MODULARITY in the Pattern Recognition System some researchers have proposed that the human brain has evolved separate modules to deal with recogniton of different types of stimuli such as faces and objects, depending on their relative importance to survival and adaption (Caramazza) A. Konorski’s (1967) Visual Recognition Taxonomy Konorski delineated nine pattern-recognition subsystems, including those that allow us to make distinctions among small vs. large objects, and objects that can be manipulated vs. those which cannot o -Nine subsystems based on size, type of object, position o ¨Small, manipulable objects o ¨Larger, partially manipulable objects o ¨Non-manipulable objects o ¨Human faces o Emotional facial expressions o Animated objects o Signs o Handwriting o Position of the limbs B. Farah (1992)
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1. Domain-Specific Recognition Systems Three major visual pattern systems o -Faces (Prosopangnosia) o -Objects (Agnosia) o -Words (Alexia) Its easy to see how face and object recognition may have been evolutionary important…distinguishing friend from foe Since language is a more recent development its possible that modules for recognizing words may be piggybacking on other systems 2. Dissociations in Neuropsychology
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IMPAIRED INTACT # Cases Faces Objects, Words 27 Faces, Objects Words 15 Faces, Ob, W none 22 Words Faces, Objects Not included Objects, Words Faces 16 Objects Faces, Words 1?
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Faces, Words Objects 1?
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This pattern of deficts suggest a modularity in the visual recognition pattern 3. Holistic vs.Decompositional Processing -Tanaka & Farah (1992) o Claim by Farah is that the three types of pattern recognition are accomplished by two different cognitive strategies--- decompositional processes (in which stimuli are decomposed into their component parts first) and holistic processing (in which the sum of the parts and their relations to each other are most important in recognition) --Subjects taught to identify a set of faces + objects (e.g., houses) --When tested with a PART from objects (e.g., door of a house), subjects better at recognizing than part of a face (e.g., nose) --Faces less decomposable than objects 4. Farah’s Conclusions -Face recognition is holistic o we do not recognize our mother by concentraiting on the eyes then the nose then the mouth and then matching it. . bc everyone we meet has both eyes nose and mouth o so since faces are processed more holistically, parts of faces are not processed or remembered well in isolation -Word recognition is decompositional o I.e words are initially recognized based on their component letters -Object recognition system shares strategies of both
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II. The Visual System A. The Eye -Lens- allows us to focus on the image -Retina -Rods (sides of retina) light/dark
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This note was uploaded on 08/03/2011 for the course PSYCH 355 taught by Professor Reeves during the Spring '11 term at University of Texas at Austin.

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EXAM2classnotes - 00:13:00 Visual Cognition I MODULARITY in the Pattern Recognition System some researchers have proposed that the human brain has

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