colour constancy

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The tendency for an object or a surface to retain approximately the same apparent colour as the amount and wavelength of light reflected from it changes under varying conditions of illumination, as when the intensity of daylight decreases and its wavelength increases at sunset. The computations required to achieve this result occur in Area V4 of the visual cortex, situated on the fusiform gyrus. US color constancy. See also Land effect, perceptual constancy, retinex theory.

Subjects: Psychology.

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