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 f orm of color constancy by asking a cerebral achromatopsic to name the colors of papers that were presented atop black, gray or white backgro unds under identical illumination. Comparison of color names across ba ckground conditions reveals poor constancy, characterized by a contras ting of foreground and background values that is not corrected by prop er anchoring. (C) 1998 Elsevier Science Ltd. All rights reserved.