Abstract

Cardinal color performance (reddish, greenish, bluish, yellowish, black, and white) has been shown to decline in peripheral viewing. What about non-cardinal color performance (e.g., orange, burgundy, and sky blue)? In visual search, performance on non-cardinal colors matched that of the cardinal colors in the $(\mathrm{L}-\mathrm{M})/(\mathrm{S}-(\mathrm{L}+\mathrm{M}))$ (isoluminant) color plane (Experiment 1, $\mathrm{n}=10$, to 30°; Experiment 2, $\mathrm{n}=3$, to 50°). However, performance in the $(\mathrm{L}-\mathrm{M})/(\mathrm{L}+\mathrm{M})$ and $(\mathrm{S}-(\mathrm{L}+\mathrm{M}))/(\mathrm{L}+\mathrm{M})$ color planes was worse for non-cardinal colors, at all eccentricities, even in the fovea. The implications that these results have for the existence of non-cardinal mechanisms in each color plane are discussed.

© 2014 Optical Society of America

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