Color—luminance relationships and the McCollough effect

Webster, Michael A.; Malkoç, Gökhan

doi:10.3758/bf03206913

Cited by 9 publications

(6 citation statements)

References 51 publications

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“…Yet the observed rotations imply a selective contrast loss of up to 50% (or more if perceived contrast also decreased along the orthogonal axis), while such large contrast changes were not subjectively evident during the experiment. Moreover, in matching tasks where both components were measured, we have observed significant hue and lightness aftereffects in test stimuli that are little changed in perceived contrast (see Webster & Malkoc, 2000, Figure 1). This raises the possibility that contrast, like hue angle, is represented by a distribution of activity across channels (Webster & Wilson, 2000).…”

Section: Discussionmentioning

confidence: 75%

Color contrast and contextual influences on color appearance

et al. 2002

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We used a hue-scaling task to examine changes in color perception resulting from adaptation or induction to color contrast in spatially-varying backgrounds. Observers judged the perceived color of tests after or while viewing backgrounds composed of color differences along selected axes in color space. Both contrast adaptation and contrast induction produced large and selective shifts in perceived hue angle, and interacted in similar ways when combined, suggesting that they had functionally similar influences on perceived hue. Both also consistently biased perceived hue away from the color axis of the background, implying response changes within multiple channels tuned to different directions in color space. Selective hue changes were also observed when the gamut of colors forming the backgrounds were drawn from natural color distributions. This suggests that color perception in different environments may be systematically biased by adaptation to the distributions of colors in those environments. However, we did not find these biases when the same test stimuli were judged after adapting to actual natural scenes.

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Section: Discussionmentioning

confidence: 75%

Color contrast and contextual influences on color appearance

et al. 2002

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“…Yet how the effect is related to other cortical color aftereffects like the ME remains unclear. For example, color contrast adaptation is also selective for orientation [17, 18], and can result in hue biases reminiscent of the color shifts conventionally measured in the ME [14, 20]. However, it remains possible that it only plays a role in the transient component of the color biases in the ME [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of color contrast adaptation

Tregillus

Webster

2014

J. Opt. Soc. Am. A

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Many forms of color adaptation have been found to reflect both short- and long-term adjustments. We explored the buildup and decay of adaptation to chromatic contrast (temporal modulations of color) for which the dynamics are unknown. A matching task was used to track the perceived contrast of chromatic pulses of varying physical contrast during and after adapting for one hour to a high contrast modulation repeated over 5 successive days. The adaptation was characterized by rapid response changes that remained stable in both time course and form across sessions. There was no consistent evidence for long-term plasticity over the timescales we tested.

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“…In previous studies, color representation models used to analyze behavioral data in color noise masking and adaptation used the luminance axis with a linear scale (e.g. Gegenfurtner & Kiper, 1992 ; Giulianini & Eskew, 1998 ; Webster & Malkoc, 2000 ; Webster & Mollon, 1994 ). Therefore, the log-scale luminance axis used in our experiment makes it difficult to directly compare the models in these previous studies and our study.…”

Section: Discussionmentioning

confidence: 99%

Luminance dependency of perceived color shift after color contrast adaptation caused by higher-order color channels

2022

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Color adaptation is a phenomenon in which, after prolonged exposure to a specific color (i.e. adaptation color), the perceived color shifts to approximately the opposite color direction of the adaptation color. Color adaptation is strongly related to sensitivity changes in photoreceptors, such as von Kries adaptation and cone-opponent mechanisms. On the other hand, the perceptual contrast of colors (e.g. perceptual saturation of the red-green direction) decreases after adaptation to a stimulus with spatial and/or temporal color modulation along the color direction. This phenomenon is referred to as color contrast adaptation. Color contrast adaptation has been used to investigate the representation of colors in the visual system. In the present study, we measured color perception after color contrast adaptation to stimuli with temporal color modulations along complicated color loci in a luminance-chromaticity plane. We found that, after the observers adapted to color modulations with different chromaticities at higher, medium, and lower luminance (e.g. temporal alternations among red, green, and red, each at a different luminance level), the chromaticity corresponding to perceptual achromaticity (the achromatic point) shifted to the same color direction as the adaptation chromaticity in each test stimulus luminance. In contrast, this luminance dependence of the achromatic point shift was not observed after adaptation to color modulations with more complex luminance-chromaticity correspondences (e.g. alternating red, green, red, green, and red, at five luminance levels, respectively). In addition, the occurrence or nonoccurrence of the luminance-dependent achromatic point shift was qualitatively predicted using a noncardinal model composed of channels preferring intermediate color directions between the cardinal chromaticity and luminance axes. These results suggest that the noncardinal channels are involved in the luminance-dependent perceived color shift after adaptation.

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Color—luminance relationships and the McCollough effect

Cited by 9 publications

References 51 publications

Color contrast and contextual influences on color appearance

Color contrast and contextual influences on color appearance

Dynamics of color contrast adaptation

Luminance dependency of perceived color shift after color contrast adaptation caused by higher-order color channels

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