Color Vision, Opponent Theory
Opponency in human color vision refers to the idea that our perceptual color mechanisms are arranged in an opponent fashion. One mechanism, the red-green mechanism, signals colors ranging from red to green; the other one, the yellow-blue mechanism, signals colors ranging from yellow to blue. This opponency is often referred to as hue opponency, as opposed to cone opponency.
Behavioral Evidence for Color-Opponent Processing
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