ISOLUMINANCE AND CONTINGENT COLOR AFTEREFFECTS

In the typical induction of the orientation-contingent color aftereffe ct (CCAE), the stimuli are composed of elements that differ in both co lor and luminance. Three experiments are reported that show that chrom atic contrast between stimulus elements is insufficient for the induct ion of the orientation-CCAE, and that luminance contrast is necessary. These experiments expand on previous research concerned with the role of luminance contrast in the induction of orientation-CCAEs by elimin ating alternative explanations.