PSYCH 2220

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PSYCH 2220 Perception Lecture 5
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Keywords for lecture 4

Lateral geniculate nucleus, layers,
magnocellular, parvocellular, magnification
factor, simple cells, complex cells, hypercomplex
cells, Hubel and Wiesel cortical cells tuned for
orientation, binocular, tuned for width-of-bars,
movement, direction, tilt after effect,
adaptation, channel coding
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Response before adaptation for each channel...
.. Is reduced depending on each channels
adaptation.
The peak of the extrapolated curve .. Is thus
shifted.
Hypothetical channels
Amount of adaptation
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Response before adaptation for each channel...
.. Is reduced depending on each channels
adaptation.
The peak of the extrapolated curve .. Is thus
shifted.
Hypothetical channels
Amount of adaptation
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Response before adaptation for each channel...
.. Is reduced depending on each channels
adaptation.
The peak of the extrapolated curve .. Is thus
shifted.
Hypothetical channels
Amount of adaptation
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Structure and organization of the cortex
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Pinwheels in the cortex
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Visualizing orientation columns in the cortex
(Using radioactive deoxyglucose)
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Ocular dominance bands over the cortex
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What happens beyond the hypercomplex
cells? Grandmother cells heirarchy prosopagnosi
a face cells hand cells anatomy
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transient cells
magnocellular layers of LGN
parvocellular layers of LGN
sustained cells
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Stimuli used to investigate processing of cells
in the inferotemporal region. The image of the
monkeys hand elicited the largest response.
...from a cell in the Inferotemporal cortex
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A face cell.
...from the Inferotemporal cortex
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An example of distributed coding
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SPATIAL VISION
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Fouriers theorem any complex curve can be
mathematical described as the sum of a series of
sine waves
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Just low frequencies
all frequencies
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invisible
Threshold contrast
visible
Spatial Frequency
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Photopic
Threshold contrast
Scotopic
Spatial Frequency