TY - JOUR T1 - The Constancy of Colored After-Images JF - bioRxiv DO - 10.1101/095935 SP - 095935 AU - Semir Zeki AU - Samuel Cheadle AU - Joshua Pepper AU - Dimitris Mylonas Y1 - 2016/01/01 UR - http://biorxiv.org/content/early/2016/12/21/095935.abstract N2 - We undertook psychophysical experiments to determine whether the color of the after-image produced by viewing a colored patch which is part of a complex multi-colored scene depends on the wavelength-energy composition of the light reflected from that patch. Our results show that, just as the color of a patch which is part of a complex scene is independent of the wavelength-energy composition of the light coming from it alone, but depends as well on the wavelength-energy composition of the light coming from its surrounds, so is the color of its after-image. Hence, traditional accounts of after-images as being the result of retinal adaptation or the perceptual result of physiological opponency, are inadequate. We propose instead that the color of after-images is generated after colors themselves are generated in the visual brain. ER -