PSYC 111 Lecture Notes - Lecture 12: Necker Cube, Visual Cortex, Trichromacy
11 Oct 2016
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Psych 111 - lecture 12 - sensation and perception. Our difference threshold for colors is so low that we can discriminate more than 1 million different color variations. About 1 in 50 people, usually male, are color deficient, defect is genetically sex-linked. Most lack functioning red- or green-sensitive cones or both. Vision is monochromatic or dichromatic instead of trichromatic. Young-helmholtz trichromatic (three-color) theory retina has three types of color receptors. When we stimulate combinations of these cones, we see other colors. Hering"s opponent-process theory two additional color processes. Ex. in both the retina and the thalamus, some neurons are turned on" by red but turned off" by green these opponent processes help explain afterimaging. Present explanations indicate that color processing occurs in two stages. 1 - the retina"s red, green, and blue cones respond in varying degrees to different color stimuli, as the young-helmholtz trichromatic theory suggested.
