Relating cone signals to color appearance: failure of monotonicity in yellow/blue.
Observers performed red-green and yellow-blue hue cancellation tasks for a 0.8-deg circular test field on a dark surround, by manipulating the excitation level of one cone class while the other two classes were held constant. The results of the red-green judgments conformed to classical opponent color theory in that both L- and S-cone excitation levels were antagonistic to M-cone signals. The yellow-blue judgments revealed a nonmonotonic nonlinearity in which the S-cone signal could act either antagonistically or synergistically with M- and L-cone signals. These results demonstrate that fixed hue sensations should not be associated with a given class of cone, even at the level of opponent neural coding.
Knoblauch
K
K
INSERM Unité 371, Cerveau et Vision, Bron, France. knoblauc@vision.univ-st-etienne.fr
Shevell
S K
SK
D003118:Color Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009474:Neurons / Q000502:physiology; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology*