PSYC 212 Lecture 10: Color perception continued
14 Feb 2019
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Document Summary
A single photoreceptor shows different responses to lights of different wavelengths but the same intensity. Principle of univariance: an infinite set of different wavelength x intensity combinations can elicit exactly the same response from a single type of photoreceptor. Therefore, one type of photoreceptor cannot make color discriminations based on wavelengths. If light a and light b are both reflected from a surface to the eye, in the perception of colour, the effects of those two lights add together. If pigment a and b mix, some of the light shining on the surface will be subtracted by a and some by b. Only the remainder contributes to the perception of colour. In subtractive we are applying a filter to what we are seeing. If we are looking at a white piece of paper, this is the spectrum of light your eye is perceiving and has all of the frequencies.
