Color-selective analysis of luminance-varying stimuli.

Alternating adaptation to red and green luminance-varying gratings of different spatial frequencies simultaneously induces opposing color-selective size aftereffects (Blakemore & Sutton, 1969) in the same retinal locus. With single-color adaptation, the aftereffect is larger and affects test patterns of both colors, though not equally. The color-insensitive portion of the effect shows very substantial interocular and cross-orientation transfer. The color-selective aftereffect, which accounts for about 1/3 of the total effect, is highly selective for both orientation and eye of origin. Thus, both color-selective and color-insensitive mechanisms participate in determining the perceptual characteristics of luminance-varying patterns.