Abstract
The magnitude of color aftereffects was measured with a color-cancellation technique after subjects adapted to oblique checkerboards in magenta light and square-wave gratings of various orientations in green light. Test stimuli were composed of achromatic patterns of an oblique checkerboard and an appropriately oriented grating. Two different spatial frequencies were used: 0.8 and 3.0 c/deg. With 3.0-c/deg stimuli, the largest color aftereffects occurred when fundamental Fourier components of adapting stimuli were oriented at 45° angles to one another. At the lower spatial frequency (0.8c/deg), the greatest color aftereffects occurred when fundamental Fourier components of adapting stimuli were in the same orientation. These findings agreed with previous color aftereffect studies which involved adapting to checkerboards and testing with gratings. They offer further support for the notion that the human visual system responds to spatial frequency content of such stimuli as it is described by two-dimensional Fourier analysis.
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