Influence of color induction on unique hues S Klauke1, T Wachtler2 |
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1Neurophysics Group, Philipps-University Marburg, Germany |
| The chromaticity of the surround influences the perceived color of a stimulus. Here, we investigated systematically how induction affects the appearance of unique hues. Subjects performed unique hue settings by adjusting the chromaticity along the azimuth angle in cone-opponent color space of a 2-degree patch presented on isoluminant backgrounds of different chromaticities. Backgrounds were either neutral gray or had a chromaticity corresponding to one of eight hue angles with fixed cone contrast with respect to the gray background. Unique hue settings on the neutral gray background were in agreement with the distributions of unique hues [Valberg, 2001, Vision Research, 41, 1645-1657; Webster et al, 2000, Journal of the Optical Society of America A, 17, 1545-1555]. On chromatic backgrounds, unique hue settings were shifted systematically away from the inducing background chromaticity. The amount of hue shift depended on the difference in hue angle between the inducer and the respective unique hue. This dependence was similar to the induction effects measured when subjects performed asymmetric matching of stimuli with chromaticities not corresponding to unique hues. These results suggest that unique hue percepts are influenced by the same mechanisms as the percepts of other colors. |
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