PSYCH 2E03 Lecture 25: Visual Cortex
3 Dec 2016
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Psych 2e03 lecture 25 visual cortex. Tend to see light and dark bands where the intensity changes abruptly. False impression of a narrow dark band immediately to the left and a narrow light band immediately to the right of each boundary. At each adjacent edge, you see a bit darker and then lighter. Rgc at point 1: centre surround has same light intensity, equally activated. Rgc 2 is at edge of boundary, centre has darker than surround, there would be an inhibition cause surround is lighter than centre (activation suppressed) Rgc 4: stimulate on/off centre cell, would fire maximally. The major retinal projection to the brain is via the (retino)geniculostriate pathway. Retina (via optic nerve, optic chiasm, optic tract) lgn: lateral geniculate nucleus (via optic radiation) v1: primary visual cortex. All info leaving retina goes through optic nerve, bundles of fibre leaving retinal ganglion cells. In the thalamus: major subcortical relay centre for visual information.
