COGS 17 Lecture Notes - Lecture 8: Optic Chiasm, Topological Map, Fusiform Gyrus
4 Dec 2016
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Document Summary
Paths along which visual info goes, crosses the brain. Right visual field goes to left eye connects to ipsilateral brain. Right visual field to right eye connects to contralateral brain. Left visual field to right eye, ipsilateral side of brain. Left visual field to left eye, contralateral brain. Optic chiasm: where two halves of the optic nerves cross. However, only after the corpus callosum does the information combine. Size is not maintained, but spatial relationships are, topological map. Activates some of same area as when you actually see the object. More visual field filled with object, more v1 area activated. Very complex, input affects many areas, begin in the retina. Dorsal pathway: where/how, involves processing motion and depth, magnocellular pathway, starts in v1, rods/cones in periphery. Ventral pathway: who/what, starts in v1, parvocellular pathway, color and detail, cones in fovea. After optic nerve, (leaving the eye) first stop is lateral geniculate nucleus (lgn) of.
