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Changes in color appearance caused by perceptual grouping

Published online by Cambridge University Press:  05 April 2005

SHERRY X. XIAN  and
STEVEN K. SHEVELL
SHERRY X. XIAN
Affiliation:
Departments of Psychology and Ophthalmology & Visual Science, University of Chicago, Chicago
STEVEN K. SHEVELL
Affiliation:
Departments of Psychology and Ophthalmology & Visual Science, University of Chicago, Chicago
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Abstract

How is chromatic induction affected by perceptual grouping? Chromatic induction has been studied extensively, as has grouping, but only a small number of experiments have connected them. Even fewer reports go beyond weakly controlled qualitative observations. We report here a new and substantial color shift caused by perceptual grouping: a shift in appearance due to chromatic induction in one part of the visual field occurs also in a separate region that belongs to the same group. The color appearance of a test square within various surrounds was measured by asymmetric matching. The test square was at the center of an “hourglass” structure formed by other elements in the surround. The test shifted in color appearance toward the appearance of these other elements, whose color was affected by local chromatic induction. Control experiments ruled out as explanations (1) direct chromatic induction from the other elements into the test area, and (2) the influence of background light occluded by introducing the elements forming the hourglass.

Keywords

Perceptual groupingChromatic induction
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 3 , May 2004 , pp. 383 - 388
Copyright
© 2004 Cambridge University Press

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