The Chromatic Antagonisms of Opponent Process Theory are not the Same as Those Revealed in Studies of Detection and Discrimination

Abstract

Wavelength discrimination for 1000-Td yellow lights was measured as a function of the wavelength of a 10-Td pre-adaptation field. Blue and red pre-adaptation fields impaired discrimination more than did violet or green fields. Our fields appear to act at a site that differences the long- and middle-wave cone signals, but this does not correspond to the `red-green' process of Opponent Colours Theory.