title: Brightness-color interactions in human early visual cortex.
abstract: The interaction between brightness and color causes there to be different color appearance when one and the same object is viewed against surroundings of different brightness. Brightness contrast causes color to be desaturated, as has been found in perceptual experiments on color induction and color-gamut expansion in human vision. However, it is not clear yet where in the cerebral cortex the brightness-color interaction that causes these major perceptual effects is located. One hypothesis is that brightness and color signals are processed separately and in parallel within the primary visual cortex V1 and only interact in extrastriate cortex. Another hypothesis is that color and brightness contrast interact strongly already within V1. We localized the brightness-color interaction in human V1 by means of recording the chromatic visual-evoked potential. The chromatic visual-evoked potential measurements decisively support the idea that brightness-color interaction arises in a recurrent inhibitory network in V1. Furthermore, our results show that the inhibitory signal for brightness-color interaction is generated by local brightness contrast at the boundary between target and surround, instead of by the luminance difference between the interior of the color target and its large background.
authors: State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, People's Republic of China, dajun_xing@bnu.edu.cn.
authors: Dajun
authors: D
authors: Xing
authors: Center for Neural Science, New York University, New York, New York 10003, and.
authors: Ahmed
authors: A
authors: Ouni
authors: Center for Neural Science, New York University, New York, New York 10003, and.
authors: Stephanie
authors: S
authors: Chen
authors: Center for Neural Science, New York University, New York, New York 10003, and.
authors: Hinde
authors: H
authors: Sahmoud
authors: Center for Neural Science, New York University, New York, New York 10003, and Psychology Department, Hunter College, New York, New York 10065.
authors: James
authors: J
authors: Gordon
authors: Center for Neural Science, New York University, New York, New York 10003, and.
authors: Robert
authors: R
authors: Shapley
mesh_terms: D003118:Color Perception; D015350:Contrast Sensitivity; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D014793:Visual Cortex / Q000502:physiology*; D055815:Young Adult
keywords: brightness; cVEP; color; inhibition; visual cortex; visual perception
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