Neurobiology April 8th

Neurobiology April 8th - Neurobiology April 8th Vision 2...

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Neurobiology April 8 th Vision 2 and 3: Higher order vision pathways Geniculo-striate: Geniculate nucleus to the visual cortex (striate cortex) Optic nerve passes through optic chiasm to geniculate nucles of thalamus, which projects to visual cortex. Different kinds of retinal ganglion cells carrying different information, thalamocortical pathway important to us Non-cortical area deals with circadian rhythms, eye movement, and other things pre- human species might have needed (pre-neocortex) Temporal side of the retina stays on the same side, nasal crosses; this applies to optic nerves. In the thalamus information from inputs remain separated. So how does it order out in the geniculate nucleus? Slide 16 Antagonism of center surround cells in lateral geniculate nucleus is very strong to sharpen up contrast from lateral inhibitory interactions. Feedback loops exist throughout synaptic circuitry (slide 17) Y cells look for transitions or moving stimuli. X cells look for fine detail of the visual
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This note was uploaded on 05/18/2008 for the course BIO 334 taught by Professor Matthews during the Fall '08 term at SUNY Stony Brook.

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Neurobiology April 8th - Neurobiology April 8th Vision 2...

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