01:830:331 Lecture Notes - Lecture 28: Visual Cortex, Superior Colliculus, Receptive Field
24 Jul 2016
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~they project to superior colliculus, involved in visual reflexes and not perception. ~they have opposite effects when the center or surround part of the receptive field is stimulated. ~on cells excited when there is light on central receptive field. ~on cells are inhibited when there is light on surround receptive field. ~off cells inhibited when there is light on center receptive field. ~off cells are excited when there is light on surround receptive field. ~these cells also have a rebound effect immediately when the illumination goes from light to dark, they will react briefly. If they were initially excited, changing the light causes brief inhibition. If they were initially inhibited, changing the light causes brief excitation. ~three types of cells in primary visual cortex. Complex cells also orientation sensitive, no inhibitory surround, detect movement. Hypercomplex cells orientation sensitive, detect the ends of lines. ~different layers of cortex (pvc) receive input from different layers of lgn.
