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Colour-contingent after-effects are really wavelength-contingent.
Nature
|April 10, 1986
Summary
The McCollough effect, a visual illusion, is triggered by the wavelength of light, not the perceived color. This study demonstrates that the physical properties of light, not subjective perception, determine the observed color aftereffects.
Area of Science:
- Visual Perception
- Color Science
- Psychophysics
Background:
- The McCollough effect is an orientation-contingent color aftereffect.
- Color constancy explains how perceived object color remains stable under varying illumination.
Purpose of the Study:
- To investigate whether the McCollough effect depends on the wavelength composition or perceived color of adaptation patterns.
- To differentiate the roles of physical light properties versus subjective perception in color aftereffects.
Main Methods:
- Utilized color constancy principles and "Mondrian" displays to embed adapting gratings.
- Manipulated the spectral composition of light reaching the adapting gratings.
Main Results:
- The McCollough effect was found to be dependent on the wavelength of light from the adapting grating.
- Perceived color of the adapting stimuli did not determine the resulting color aftereffect.
Conclusions:
- The McCollough effect is primarily driven by the physical wavelength of light, not the perceived color.
- This finding highlights the influence of objective light properties on visual aftereffects, challenging purely subjective explanations.