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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 31, Iss. 4 — Apr. 1, 2014
  • pp: A247–A253

Symmetries and asymmetries in chromatic discrimination

M. V. Danilova and J. D. Mollon  »View Author Affiliations

JOSA A, Vol. 31, Issue 4, pp. A247-A253 (2014)

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Under conditions of adaptation to a steady neutral field (metameric to Daylight Illuminant D65), forced-choice thresholds for color discrimination were measured for brief targets presented to the human fovea. Measurements were made along +45° and 45° lines in a MacLeod–Boynton chromaticity space scaled so that the locus of unique yellow and unique blue lay at 45°. The lines were symmetrical relative to the tritan line passing through the chromaticity of D65. Thresholds increased with distance of the probe chromaticity from D65. Thresholds were higher for saturation discrimination than for hue discrimination. A region of enhanced discrimination was found for thresholds measured orthogonally to the locus of unique blue and unique yellow. There may be an analogous enhancement near the loci of unique red and unique green.

© 2014 Optical Society of America

OCIS Codes
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision
(330.5020) Vision, color, and visual optics : Perception psychology
(330.5510) Vision, color, and visual optics : Psychophysics
(330.7320) Vision, color, and visual optics : Vision adaptation

ToC Category:
Chromatic discrimination

Original Manuscript: October 3, 2013
Revised Manuscript: December 24, 2013
Manuscript Accepted: December 24, 2013
Published: February 12, 2014

Virtual Issues
Vol. 9, Iss. 6 Virtual Journal for Biomedical Optics

M. V. Danilova and J. D. Mollon, "Symmetries and asymmetries in chromatic discrimination," J. Opt. Soc. Am. A 31, A247-A253 (2014)

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