Abstract

Color-normals may be divided into two distinct groups by studying (i) the spectral location of unique green, (ii) the additivity of spectral lights, (iii) the rate of recovery of sensitivity, and (iv) the colorimetric coordinates for “white.” The results of any one of these tests may be used to predict an individual’s performance on the remaining tests. Taken together, the results suggest that, for some individuals, 540-mm cone activity innervates the same channel activated by the 440-nm cones. This desaturation effect of the 540-nm cones cannot be entirely neural, however, because of certain differences in color matches.

© 1967 Optical Society of America

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