A Comparison of Fourier Analysis and Feature Analysis in Pattern-Specific Color Aftereffects

Abstract

Subjects were adapted to alternating upright red and oblique green checkerboards. After adaptation, vertical and horizontal gratings appeared pink and oblique gratings appeared green. The results show an orientation and spatial frequency selectivity predicted by two-dimensional Fourier analysis.

The roles of pattern orthogonality and color contrast in the generation of pattern-contingent color aftereffects

“…It has been proposed that certain forms of contingent color aftereffects can be understood in terms of the adaptation of components that perform a form of two-dimensional Fourier analysis on the visual input (e.g., Green, Corwin, & Zemon, 1976;May & Matteson, 1976). We do not believe that such an analysis leads to further insight into the effects we have demonstrated.…”

Spatial frequency content of visual imagery

“…Previous studies (Green, Corwin, & Zemon, 1976;May, Agamy, & Matteson, 1978;May & Matteson, 1976; May, Matteson, Agamy, & Castellanos, 1978) had established that, when checkerboards with spatial frequencies above 3.0 cycles/deg were used as stimuli, McCollough effects were derived from adaptation to the fundamental spatial frequency components. If the same spatial frequency components in actual stimuli were contained in imagined stimuli, then adaptational effects might be mediated by the fundamentals in imagined checkerboards.…”

Spatial-frequency-contingent color aftereffects: Adaptation with two-dimensional stimulus patterns

“…The occurrence of color aftereffects (CAEs) was tested with test slides and also with a computer graphics system, which allowed the presentation of sine-wave gratings as well as square-wave gratings. Since neither May and Matteson (1976) nor Green et al (1976) specified the contrast of their stimuli, except to say that it was "high contrast," the maximum level of contrast was employed in the present experiment to give conditions comparable with their previous work.…”

“…The purpose of Experiment I was to replicate the checkerboard results described above using experimental conditions similar to those of May and Matteson (1976) and Green et al (1976). Observers were adapted with slide-presented checkerboards with a check size of either 2.0 or 5.0 cpd.…”