A tritan Waldo would be easier to detect in the periphery than a red/green one: evidence from visual search

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Rob N Dalhaus, Karen L Gunther

Abstract

In a color naming task from 0° to 55° eccentricity, we found that red/green performance (n=10 subjects) declines around 40° eccentricity, 5° earlier than does tritan performance (main effect of color, p=0.009; eccentricity, p<0.001; interaction, p=0.005). 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, p=0.007; eccentricity, p<0.001; interaction, p=0.003). 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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Citations

Apr 4, 2014·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Karen L Gunther
Jul 22, 2020·Attention, Perception & Psychophysics·Karen L Gunther, Mason R McKinney

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