Dependence of color on context in a case of cortical color vision deficiency.
Color constancy depends on sensitivity to change in both illumination spectral properties and object position. We investigated this latter form of color constancy by asking a cerebral achromatopsic to name the colors of papers that were presented atop black, gray or white backgrounds under identical illumination. Comparison of color names across background conditions reveals poor constancy, characterized by a contrasting of foreground and background values that is not corrected by proper anchoring.
D'Zmura
M
M
Department of Cognitive Sciences, UC Irvine 92697, USA. mdzmura@uci.edu
Knoblauch
K
K
Henaff
M A
MA
Michel
F
F
D001927:Brain Diseases / Q000503:physiopathology; D003118:Color Perception / Q000502:physiology*; D003119:Color Perception Tests; D006801:Humans; D008029:Lighting; D008297:Male; D008875:Middle Aged; D014793:Visual Cortex / Q000503:physiopathology*