day14 - Psychology 2050 Perception Day 14 14 October 10...

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Psychology 2050 Perception Day 14 14 October 10 Prelims to be handed back
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    Lateral and Temporal Inhibition Mach bands   -- anisomorphism Kuffler (ganglion) cells -  receptive fields     center-surround organization    "Mexican hat" function a model of lateral inhibition lateral inhibition in other senses   audition, touch, taste    audition, touch, olfaction 
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Ernst Mach
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Ernst Mach
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luminance low high
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high low
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luminance:      low to high: brightness:    dim to bright: 2 < 4 < 1 < 3 1 2 3 4 anisomorphism
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how and why does this occur? lateral inhibition but first, receptive fields and vision
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From Day 13 and beyond
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periphery fovea light 120 million rods           5  million cones              1.5  million ganglion cells remember: inverted retina
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hexagonal grid  of retinal cells in  fovea
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fovea parafovea near periphery
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+ receptor  serving as  excitatory  center for a  ganglion  cell
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+ - - - - - - excitatory center with  inhibitory surround of  receptors for a ganglion  cell
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+ - - - - - - “sideways” view of  stimulation profile
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+ - - - - - - “Mexican hat” function,  difference of Gaussian  (bell shaped) curves rate of  spontaneous  neural firing
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“Mexican hat” function,  DoGs rate of  spontaneous  neural firing
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+ - - - - - - bar of light
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+ - - - - - -
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+ - - - - - -
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+ - - - - - -
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+ - - - - - -
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+ - - - - - - smallest  receptive  field
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+ - + + - - - - - - - - larger
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+ + + - - - - - + + + + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - larger still - - - - -
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magno parvo Day 15
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This note was uploaded on 01/27/2011 for the course PSYCH 2050 at Cornell University (Engineering School).

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day14 - Psychology 2050 Perception Day 14 14 October 10...

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