PHYL 2041 Lecture Notes - Lecture 18: Amacrine Cell, Ganglion Cell, Visual Cortex
26 Nov 2018
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Phyl 2041 lecture 18 november 20, 2018 visual receptive field, visual pathways, lateral geniculate, The retina is a thin layer of cells. The light comes in by going through the ganglion cells and other cells until it strikes the rods and cones. The electrical signals produced by the rods and cones goes back through the bipolar cells to the ganglion cells. By turning the light on and off and by looking at the different layers of cell , the sort of processing going on the retina can be analysed. The light is turned on and then off as indicated by the first black signal. This causes hyperpolarization of the receptor cells and leads to a dark current due to the lack of light (na/k channels are opened where there is enough cgmp). Hyperpolarization occurs due to the reduction of cgmp and the dark current. The stronger the light, the larger the hyperpolarization.
