PSYCH 9A Lecture Notes - Lecture 27: Retina, Opponent Process, Mutation
14 Jun 2016
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Document Summary
Visual system amplifies brightness boundaries by edge enhancement which relies on brightness contrast and allows us to see the edges between objects more clearly. Nervous system is cleaning the input and doing more than just receiving and recording: color, distinguish 7 million shades of color. Hue: tell difference from blue from green from red: also bright orange, middle orange and dark orange. Saturation: purity of a color: extent to which it is chromatic rather than achromatic, color receptors, more grey mixed with a color = less saturation, trichromatic color vision: the principle underlying human color vision. Color vision occurs through the operation of three sets of cones, each maximally sensitive to a different wavelength of light. Each cone contains a different photopigment: broad range of wavelength but patterns of sensitivity are distinct. Short preferring and middle preferring cones respond equally. Together response is double long preferring cones: 580 nm.
