In a color naming task from 0° to 55° eccentricity, we found that red/green performance ( subjects) declines around 40° eccentricity, 5° earlier than does tritan performance (main effect of color, ; eccentricity, ; interaction, ). In a feature visual search task (e.g., red target dot among green distractor dots; twelve 2.5° diameter dots; 0, 20, and 45° eccentricity; 12 subjects), performance was significantly more impaired for red/green than for tritan stimuli, especially in the periphery (main effect of color, ; eccentricity, ; interaction, ). This effect occurred even following a rod bleach. Our results are consistent with influences from both the retina (especially random rather than selective peripheral cone input to midget ganglion cells for red/green perception, and selective cone input to small bistratified cells for tritan perception) and the cortex (differential cortical magnification across the two chromatic axes).
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