PSYB51H3 Study Guide - Midterm Guide: Optical Flow, Zoom Lens, Smooth Pursuit
Document Summary
The more wavelengths absorbed, the darker the colour we see. The color of what we see depends on which wavelengths get reflect and hit the eye. 3 steps: detection: wavelengths must be detected. We have 3 cone photoreceptors: s-cones (short, blue; 420), m-cones (medium, green; 535) and l- cones (long, red; 565). S-cones are rarer and less sensitive: discrimination: we must be able to tell the difference between wavelengths. Problem of univariance: the output of a single photoreceptor is ambiguous (several combinations of wavelength intensities will produce the same respnonse in the photoreceptor). In the dark, because only one type of rod cones exist (rhodopsin), we can"t discriminate colours. This shows that color is psychophysical, not physical. Trichromatic solution: trichromatic theory of color vision (trichomacy): color of any light is defined by relationships of the outputs of 3 cones (aka young-
