PSYC 3250 Chapter Notes - Chapter 6: Parahippocampal Gyrus, Fusiform Face Area, Motor System
24 Feb 2017
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Document Summary
Light consists of electromagnetic radiation, similar to radio waves but of a different frequency and wavelength. Color can vary in three perceptual dimensions: hue, brightness, and saturation, which correspond to the physical dimensions of wavelength, intensity, and purity. Photoreceptors communicate through synapses with bipolar cells, which communicate through synapses with ganglion cells. In addition, horizontal cells and amacrine cells combine messages from adjacent photoreceptors (they run parallel to the surface of the retina). The lens (immediately behind the iris) is a convex, transparent disk, which refracts light to focus on the retina. The lens shape can be altered by contraction of the ciliary muscles. These changes in ion shape permit the eye to focus images of near or distant objects on the retina accommodation. To focus on close object, muscles around lens contract (lens rounder). To focus on far object, muscles in lens flatten. Near & far sighted ppl have trouble making these accommodations.
