INFLUENCE OF THE LUMINANCE SIGNAL AND RED-GREEN AND YELLOW-BLUE OPPONENT CHROMATIC SIGNALS IN FIGURAL-STIMULI STEREOGRAMS

The influence of color signals on stereopsis has been studied using fi gural-stimuli stereograms with variations introduced according to the opponent chromatic channels (red-green and yellow-blue), derived from Boynton's color-vision model. We used wallpaper stereograms, which ena ble the rank-order disparity ranges of the chromatic and luminance sig nals to be compared with the rank-order disparity range of proximity, a particular spatial configuration of the stereogram in which there ar e no variations in chromaticity and/or luminance. The results indicate that both chromatic signals contribute to stereopsis as does the lumi nance signal, contradicting the model of Hubel and Livingstone. The re sults also show there are no clear dependencies upon the kind of signa l processed, as luminance and chromatic variations are processed with the same efficiency.