Physiology 4710A/B Study Guide - Final Guide: Middle Temporal Gyrus, Auditory Cortex, Visual Acuity
9 Dec 2016
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Distant object close object: shape of eyeball: Convex lens too flat (old age, lens loses elasticity) laser surgery adjust the curvature of the cornea. Constricts to prevent too much light enter. Cones: color vision, acuity fovea, no ap; only graded potential. Rods: no color vision, periphery retina, poor acuity large receptive field, no ap, sensitive to low illumination. Bipolar cell: connect receptors (rod and cones) to the ganglion cell. Ganglion cell: only output from the eye, ap. Horizontal cell: converge signals from many receptors (rods and cone, no ap. Amacrine cell: converge signal from periphery rods, some have ap, graded potential vs. action potential. Many convergences to one large ganglion cell. Receptive field: area of retina over which light changes activity of one ganglion cell, there are equal # of on and off center cell, antagonist surround receptive field. Function of antagonist surround: attenuate edge: Off center: sense relative darkness: constancy. Color vision: blue, green, red cone system, advantage:
