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| • |
Many depolarizations must sum at a
ganglion cell.
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Horizontal cells and amacrine cells -
integration of
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all excitatory
and inhibitory stimuli- threshold
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depolarization
required at the ganglion cell.
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Lateral divergence of stimuli from
horizontal and
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amacrine cells
produce "on center" or "off center"
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fields" -
excitation depends on stimulation of
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adjacent areas. -
works to enhance contrast.
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