day15 - Psychology 2050 Perception 19 October 10 Day 15...

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Unformatted text preview: Psychology 2050 Perception 19 October 10 Day 15 Visual Pathways 1. geniculostriate system retina -receptors (rods & cones) layer of 3 interneurons -- plexiform; ganglion cells lateral geniculate nucleus (LGN, part of thalamus) parvo, magno, konio layers primary visual cortex - V1 higher regions, extrastriate cortex (V2, V3, V4, MT, etc.) the rule of opposition in vision hemifields --> hemiretinas --> hemispheres coding 7 dimensions in a 3D cortex 2. tectothalamic ( tectopulvinar) system dorsal and ventral streams Days 11 & 14 ganglions cells gather at blind spot to form optic nerve (2nd cranial nerve) , go to the optic chiasm (more later), then go (mostly) to the lateral geniculate nucleus, LGN (part of the thalamus) geniculostriate pathway tectothalamic (tectopulvinar) pathway pulvinar is part of the thalamus superior colliculus (‘upper hills”) ~ tectum LGN is part of the thalamus lateral geniculate nucleus (left, top view) from retina, and chiasm to cortex from cortex c c c i i i 4 parvo layers 2 magno layers c c c i i i i = ipsilateral, left eye c = contralateral, right eye konio layers Magno cells (big): 10% relatively fast conducting (~30 ms retina to cortex) luminance (light vs. dark, not color; and not just rods) low spatial frequency, high temporal resolution transient (rapidly adapting) Parvo cells (small): 80% relatively slow conducting (~70 ms retina to cortex) color high spatial frequency, low temporal resolution sustained (slowly adapting) Konio cells (“dust,” very small): 10% variable velocity medium spatial frequency, high temporal resolution from day 14 magno parvo konio from LGN to striate cortex (V1) eyes V1 ocular dominance and orientation columns Siamese cats from V1 to higher areas (V2, V3, V4, IT, MT)...
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This note was uploaded on 01/27/2011 for the course PSYCH 2050 at Cornell.

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day15 - Psychology 2050 Perception 19 October 10 Day 15...

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