Ch3_Perception

Ch3_Perception - CHAPTER 3 Perception: Experiences...

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CHAPTER 3 Perception: “Experiences resulting from imulation of the senses” stimulation of the senses
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utline Outline ottom- and top- own processing 1. Bottom up and top down processing 1. Feature detection, visual search (Coglab) . eons nd recognition by components 2. Geons and recognition by components 3. Top-down processing 1. Speech 2. Helmholtz’s theory of unconscious inference 3. Gestalt principles of perceptual organization 2. Face perception 3. Scene perception
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C l it f P ti The Complexity of Perception Bottom-up processing Perception starts with stimulation of the senses Primitive features identified, grouped into simple shapes Shapes activate representations of meaningful entities such as objects, words, scenes Top-down processing “Perceive what you expect” Expectations drive or at least influence what you perceive, often by filling in
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TE CT / -\
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Giuseppe Arcimboldo (1527-1593), 'Estate ("Summer") 1573 Le Louvre Museum LEstate (Summe r), 1573, Le Louvre Museum.
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t t Pi Bottom-up Processing ensory systems transmits information to the central Sensory systems transmits information to the central nervous system alamus processes and relays the neural response Thalamus processes and relays the neural response Relayed to specialized areas of the cortex atures detected grouped meaningful entities Features detected, grouped, meaningful entities identified e perceive the world We perceive the world
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ature Detection Feature Detection oglab xperiment Coglab experiment Independent variables: hether green circle present or absent Whether green circle present or absent Number of distractors ependent variable: time to identify green circle Dependent variable: time to identify green circle Results:
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N=24 N=37,518 16 16
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N=24 N=37,518 16 16
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ature detection Feature detection you can search for a simple feature, easy and If you can search for a simple feature, easy and happens automatically ut if you must search for item defined by a
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This note was uploaded on 02/17/2011 for the course PYSC 405 taught by Professor Ferreira during the Spring '11 term at South Carolina.

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Ch3_Perception - CHAPTER 3 Perception: Experiences...

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