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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 22, Iss. 10 — Oct. 1, 2005
  • pp: 2090–2106

Do common mechanisms of adaptation mediate color discrimination and appearance? Uniform backgrounds

James M. Hillis and David H. Brainard  »View Author Affiliations


JOSA A, Vol. 22, Issue 10, pp. 2090-2106 (2005)
http://dx.doi.org/10.1364/JOSAA.22.002090


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Abstract

Color vision is useful for detecting surface boundaries and identifying objects. Are the signals used to perform these two functions processed by common mechanisms, or has the visual system optimized its processing separately for each task? We measured the effect of mean chromaticity and luminance on color discriminability and on color appearance under well-matched stimulus conditions. In the discrimination experiments, a pedestal spot was presented in one interval and a pedestal + test in a second. Observers indicated which interval contained the test. In the appearance experiments, observers matched the appearance of test spots across a change in background. We analyzed the data using a variant of Fechner’s proposal, that the rate of apparent stimulus change is proportional to visual sensitivity. We found that saturating visual response functions together with a model of adaptation that included multiplicative gain control and a subtractive term accounted for data from both tasks. This result suggests that effects of the contexts we studied on color appearance and discriminability are controlled by the same underlying mechanism. © 2005 Optical Society of America

© 2005 Optical Society of America

OCIS Codes
(330.1690) Vision, color, and visual optics : Color
(330.4060) Vision, color, and visual optics : Vision modeling

ToC Category:
Color Vision

History
Original Manuscript: February 8, 2005
Revised Manuscript: April 14, 2005
Manuscript Accepted: April 18, 2005
Published: October 1, 2005

Citation
James M. Hillis and David H. Brainard, "Do common mechanisms of adaptation mediate color discrimination and appearance? Uniform backgrounds," J. Opt. Soc. Am. A 22, 2090-2106 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-10-2090

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