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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: Franco Gori
  • Vol. 29, Iss. 2 — Feb. 1, 2012
  • pp: A82–A95

1/f noise in human color vision: the role of S-cone signals

José M. Medina and José A. Díaz  »View Author Affiliations


JOSA A, Vol. 29, Issue 2, pp. A82-A95 (2012)
http://dx.doi.org/10.1364/JOSAA.29.000A82


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Abstract

We examine the functional role of S-cone signals on reaction time (RT) variability in human color vision. Stimuli were selected along red–green and blue–yellow cardinal directions and at random directions in the isoluminant plane of the color space. Trial-to-trial RT variability was not statistically independent but correlated across experimental conditions and exhibited 1/f noise spectra with an exponent close to unity in most of the cases. Regarding contrast coding, 1/f noise for random chromatic stimuli at isoluminance was similar to that for achromatic stimuli, thus suggesting that S-cone signals reduce variability of higher order color mechanisms. If we regard spatial coding, the effect of S-cone density in the retina on RT variability was investigated. The magnitude of 1/f noise at 16 min of arc (S-cone free zone) was higher than at 90 min of arc in the blue–yellow channel, and it was similar for the red–green channel. The results suggest that S-cone signals are beneficial and they modulate 1/f noise spectra at postreceptoral stages. The implications related to random multiplicative processes as a possible source of 1/f noise and the optimal information processing in color vision are discussed.

© 2012 Optical Society of America

OCIS Codes
(330.1720) Vision, color, and visual optics : Color vision
(330.1800) Vision, color, and visual optics : Vision - contrast sensitivity
(330.1880) Vision, color, and visual optics : Detection
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5310) Vision, color, and visual optics : Vision - photoreceptors

ToC Category:
Color sensitivity and appearance

History
Original Manuscript: September 1, 2011
Revised Manuscript: November 15, 2011
Manuscript Accepted: November 16, 2011
Published: January 13, 2012

Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics

Citation
José M. Medina and José A. Díaz, "1/f noise in human color vision: the role of S-cone signals," J. Opt. Soc. Am. A 29, A82-A95 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-2-A82

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