Hue-discrimination functions were derived from hue-naming data (, steps) obtained in intervals from to postbleach at temporal retinal eccentricity. Hue-naming data were also obtained in the fovea. Hue-discrimination functions derived at the 4, 8, and intervals were very similar to those derived in the fovea. As time postbleach exceeded and rod sensitivity increased, the shape of the hue- discrimination functions changed. Most notably, the minimum between disappeared and the just noticeable differences (JNDs) for the longer wavelength stimuli increased. The long-wavelength suppression in hue discrimination may be due to rod input in the magnocellular pathway interacting and affecting the long- wavelength sensitivity of the parvocellular pathway.
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