perception - Vision.continued Light & Dark, Color & Shape,...

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04/02/12 Perception 1 Vision….continued Light & Dark, Color & Shape, Movement, Location, Eye movements Sensory Registration Feature analysis at different levels of the visual system Three visual tracts Geons Memory for faces, agnosias Selectivity and constancy/tolerance for variation in recognition
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On – off receptive field of RG cell 04/02/12 Perception 2 C:\Users\iyogi\ ments\Lectures\C
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Blind s ig ht re s ults  whe n 04/02/12 Perception 3 0% 0% 0% 100% 1. The  re tina  is  de s tro ye d b y injury o r  dis e as e 2. The  “whe re ” pa thway is  dis rupte d 3. The  “what” pa thwa y is  dis rupte d 4. The  e ye  m o ve m e nt pa thway is   dis rupte d
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The  “wha t” vis ual pa thway e xte nds 04/02/12 Perception 4 11% 23% 54% 12% 1. Fro m  re tina  to  vis ua l c o rte x 2. Fro m  re tina  to  LG N o f thala m us  to  vis ua l c o rte x to  infe rio r te m po ra l c o rte x 3. Fro m  re tina  to  pulvina r nuc le us  o f  thala m us  to  pa rie tal lo b e 4. Fro m  re tina  to  s upe rio r c o llic ulus  to  e ye   m us c le s
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Fe a ture  de te c to rs  in the  vis ual s ys te m   04/02/12 Perception 5 18% 14% 60% 9% 1. O nly re s po nd to  ve ry s pe c ific  s tim uli 2. Re s po nd m axim a lly to  vis ual inputs   with s pe c ific  c hara c te ris tic s 3. O nly e xis t in the  prim a ry vis ua l c o rte x 4. O nly e xis t in the  LG N o f the  tha lam us
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04/02/12 Perception 6 How do we turn features into objects? Bottom-up processes driven by sensory input Top down processes guided by expectations, context, intentions
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04/02/12 Perception 7 Visual Recognition S urfa c e s  a re  g ro upe d into  o bje c ts O b je c t re pre s e nta tio ns  a re  m a de  o ut o f  g e o m e tric  pa rts O b je c t re pre s e nta tio ns  a re  c o m pa re d to  s to re d  re pre s e nta tio ns Re pe titio n o f no ve l (ne w) o b je c ts  le a ds  to   c re a tio n o f re pre s e nta tio ns  tha t c a n b e  a c tiva te d  b y future  pre s e nta tio n….le a ding  to  a  re c o g nitio n  re s po ns e
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What does a theory have to account for? Inva ria nc e  o f re c o g nitio n a c ro s s   c o ns ide ra b le  varia nc e  in input S pe e d o f re c o g nitio n o f the  fa m iliar 04/02/12 Perception 8
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Two major categories of theories of recognition Vie w invariant the o rie s : the  c o rte x  pe rfo rm s  a ne ural c a lc ulatio n that  tra ns fo rm s  the  vis ua l s truc ture  o f diffe re nt  im a g e s  into  a c o m m o n fo rm a t Vie w de pe nde nt the o rie s : te m po ral  a s s o c ia tio ns  b e twe e n diffe re nt vie ws  are   le a rne d and s to re d in m e m o ry 04/02/12 Perception 9
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04/02/12 Perception 10 How are shapes constructed? De pth a nd te xture  patte rns  c o m b ine d, 
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This note was uploaded on 04/01/2012 for the course PSYCHOLOGY Cognition taught by Professor Ingate during the Spring '10 term at Rutgers.

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perception - Vision.continued Light & Dark, Color & Shape,...

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