Abstract

We have used a subthreshold summation protocol to analyze spatial color–color interaction. By means of a CRT color monitor, we measured the threshold contours for a spatial frequency of 0.5 cycles/degree. Heterochromatic flicker photometry was used to obtain isoluminance. The results suggest that the blue–yellow (b–y) and red–green (r–g) contrast thresholds remained unchanged by the addition of fixed r–g and b–y subthreshold pedestals. Our subthreshold summation data then support the stochastic independence of color-vision mechanisms derived from Mullen and Sankeralli’s work [Vision Res. 39, 733 (1999)] despite the differences that exist between the two experimental methods.

© 2000 Optical Society of America

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