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Very-long-term chromatic adaptation: Test of gain theory and a new method

Published online by Cambridge University Press:  03 July 2008

SUZANNE C. BELMORE  and
STEVEN K. SHEVELL
SUZANNE C. BELMORE*
Affiliation:
Department of Psychology, University of Chicago, Chicago, Illinois
STEVEN K. SHEVELL
Affiliation:
Department of Psychology, University of Chicago, Chicago, Illinois Department of Ophthalmology and Visual Science, University of Chicago, Chicago, Illinois
*
Address correspondence and reprint requests to: Suzanne C. Belmore, Visual Science Laboratories, University of Chicago, 940 E. 57th Street, Chicago, IL 60637. E-mail: sbelmore@midway.uchicago.edu
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Abstract

This research had two goals. First, a new method of very-long-term chromatic adaptation was compared to an older method of long-wavelength ambient illumination. In the new method, the observer viewed for 1 h per day for 12 or 14 days a CRT screen composed of oriented lines that appeared red. One observer also replicated a previous procedure (Neitz et al., 2002) in which she was exposed to long-wavelength room illumination for 4 h per day for 14 days. For both methods, equilibrium yellow was measured each day about 20 h after the end of the adaptation period. Both methods of very-long-term chromatic adaptation gave similar results. Second, shifts in equilibrium yellow were measured over a 30:1 range of light levels to determine if changes in color percepts were explained solely by a gain change in cone sensitivities (von Kries coefficient law). The magnitude of shift of equilibrium yellow depended on the level of the test light, which was not consistent with a gain theory of very-long-term chromatic adaptation.

Keywords

Long-term chromatic adaptationEquilibrium yellowEquilibrium hueGainvon Kries coefficient law

Information

Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 3 , May 2008 , pp. 411 - 414
Copyright
Copyright © Cambridge University Press 2008

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