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lecture 18 slides - The consequences of a short period of...

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Experience-dependent Plasticity of the Visual Cortex
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11.12 Columnar organization of orientation selectivity in the monkey striate cortex.
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How neighboring RFs in the LGN must connect in the cortex to give simple cells of different orientations.
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Visual experience shapes orientation selectivity Blakemore & Van Sluyters, 1975
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Testing for orientation selectivity in cat cortex Blakemore & Van Sluyters, 1975 Polar plot of orientations: Normal cat
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11.13 Columnar organization of ocular dominance.
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Hypercolumns in visual cortex
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23.3 Ocular dominance columns in layer IV of the primary visual cortex of a macaque. (Part 1)
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23.3 Ocular dominance columns in layer IV of the primary visual cortex of a macaque. (Part 2) Layer IV
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23.4 Effect of early closure of one eye on the distribution of cortical neurons. (Part 1)
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23.4 Effect of early closure of one eye on the distribution of cortical neurons. (Part 2)
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23.5
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Unformatted text preview: The consequences of a short period of monocular deprivation at the critical period in the cat. 23.9 Ocular dominance histograms obtained by electrophysiological recordings in cats. 23.8 Representation of Hebb’s postulate as it might operate during visual system development. 23.6 Effect of monocular deprivation on ocular dominance columns in the macaque monkey. 23.7 Terminal arborizations of LGN axons in the visual cortex can change rapidly. Conclusions • The wiring of visual cortex is only crudely specified by genetic/developmental factors, the fine tuning depends on visual experience. • Experience can only alter visual circuits early in life during a critical period (cataracts and vision, language learning etc). • Experience may affect circuits through Hebbian plasticity. Other processes may lead to long lasting changes in the anatomy of neurons....
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