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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 Shape Construction & Object Recognition 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 by injury o r  dis e as e 2. The  “whe re ” pathway is  dis rupte d 3. The  “what” pathway is  dis rupte d 4. The  e ye  m o ve m e nt pathway is   dis rupte d
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The  “what” vis ual pathway e xte nds 04/02/12 Perception 4 11% 23% 54% 12% 1. Fro m  re tina to  vis ual c o rte x 2. Fro m  re tina to  LG N o f thalam us  to  vis ua c o rte x to  infe rio r te m po ral c o rte x 3. Fro m  re tina to  pulvinar nuc le us  o f  thalam us  to  parie tal lo be 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 ature  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 ally to  vis ual inputs   with s pe c ific  c harac te ris tic s 3. O nly e xis t in the  prim ary vis ual c o rte x 4. O nly e xis t in the  LG N o f the  thalam 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 urfac e s  are  g ro upe d into  o bje c ts O bje c t re pre s e ntatio ns  are  m ade  o ut o f  g e o m e tric  parts O bje c t re pre s e ntatio ns  are  c o m pare d to  s to re d  re pre s e ntatio ns Re pe titio n o f no ve l (ne w) o bje c ts  le ads  to   c re atio n o f re pre s e ntatio ns  that c an be  ac tivate d  by future  pre s e ntatio n….le ading  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? Invarianc e  o f re c o g nitio n ac ro s s   c o ns ide rable  varianc e  in input S pe e d o f re c o g nitio n o f the  fam 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 alc ulatio n that  trans fo rm s  the  vis ual s truc ture  o f diffe re nt  im ag e s  into  a c o m m o n fo rm at Vie w de pe nde nt the o rie s : te m po ral  as s o c iatio ns  be twe e n diffe re nt vie ws  are   le arne 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?
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