Effect of background colors on the tuning of color-selective cells in monkey area V4

Journal of Neurophysiology
Makoto KusunokiS Zeki

Abstract

When objects are viewed in different illuminants, their color does not change or changes little in spite of significant changes in the wavelength composition of the light reflected from them. In previous studies, we have addressed the physiology underlying this color constancy by recording from cells in areas V1, V2, and V4 of the anesthetized monkey. Truly color-coded cells, ones that respond to a patch of a given color irrespective of the wavelength composition of the light reflected from it, were only found in area V4. In the present study, we have used a different approach to test the responses of V4 cells in both anesthetized and awake behaving monkeys. Stimuli of different colors, embedded within a Mondrian-type multicolored background, were used to identify the chromatic selectivity of neurons. The illumination of the background was then varied, and the tuning of V4 neurons was tested again for each background illumination. With anesthetized monkeys, the psychophysical effect of changing background illumination was inferred from our own experience, whereas in the awake behaving animal, it was directly reported by the monkey. We found that the majority of V4 neurons shifted their color-tuning profile with each change in t...Continue Reading

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Citations

Mar 22, 2007·Nature Reviews. Neuroscience·Samuel G Solomon, Peter Lennie
Oct 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Bevil R Conway, Doris Y Tsao
Jun 8, 2012·Journal of Neurophysiology·Brittany N Bushnell, Anitha Pasupathy
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Jan 13, 2021·Current Biology : CB·David A Leopold, Arash Afraz

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