Abstract

Color-naming experiments were done at the 36 retinal positions with up to 70° eccentricity in the eight meridians for four spectral lights of nearly unique hues that were presented on the gray semi-sphere field of 120 nt (about 2000 scotopic Td). The four unique hues were chosen as typical hues based on another experiment. This level of light adaptation corresponds to the lower limit of the rod saturation. Test stimuli (2°) were equated in brightness to the white reference (250 nt, 2°) at the fovea and were presented for 1 s. The results of three observers' right eyes showed that (1) the chromatic component normalized at the fovea had trapezoidlike profiles for each stimulus, (2) its plateau roughly took an elliptical shape extended to the temporal side in the visual field and its shortest radius from the fovea was 20°–30°, and (3) the differences between plateau sizes for the four unique hues were not so large as those of the previous studies, e.g., the ones in OSA color zones (1953). We propose new color-zone maps in the periphery.

© 1992 Optical Society of America