1 The reason why Rita's favorite navy blue sweater is perceived as maintaining its hue whether she is outdoors or indoors, even though the wavelengths of light change is because of color constancy. Color constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. Subjective constancy is the physiological basis for color constancy it is thought to involve specialized neurons in the primary visual cortex that compute local ratios of cone activity. These specialized cells are called double-opponent cells because they compute both color opponency and spatial opponency. Double-opponent cells were first described by Nigel Daw in the goldfish retina. There was considerable debate about the existence of these cells in the primate visual system; their existence was eventually proven using reverse-correlation receptive field mapping and special stimuli that selectively activate single cone
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