Fig. 2.

A larger category effect is observed in the RVF on a color detection task. (a) Munsell codes of the stimuli; stimuli varied in hue at constant value and chroma. Hue separations were either five steps (far set) or 2.5 steps (near set). The target was either in the same color category as the background (e.g., 10BG on 5B, both blue) or in the adjacent category (e.g., 10BG on 5BG, blue on green). (b) Illustration of a test frame: white circles show possible target locations around the fixation cross, and the black circle representing the target. (c and d) Blue-green set: The difference in RT between within- and across-category is larger in the RVF (c). Target-background perceptual separation only affects the RVF (d). (e) Blue-purple set: Again, the difference in RT between within- and across-category is larger in the RVF. Error bars are 95% confidence limits.