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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

  • Vol. 17, Iss. 3 — Mar. 1, 2000
  • pp: 369–379

The achromatic mechanism and mechanisms tuned to chromaticity and luminance in visual search

Allen L. Nagy and Marc Winterbottom  »View Author Affiliations


JOSA A, Vol. 17, Issue 3, pp. 369-379 (2000)
http://dx.doi.org/10.1364/JOSAA.17.000369


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Abstract

The purpose of the study was to determine whether visual search can be mediated by an achromatic, or luminance, mechanism in which signals are independent of the chromaticity of the stimuli. Experiments were designed to determine whether variability in the chromaticity of distractor stimuli made it more difficult to search for a target that differed from the distractor stimuli in luminance. Variability in the chromaticity of the distractors had little or no effect on search times when the target stimulus was white. Variability in the chromaticity of the distractors increased search times when the target was a reddish or bluish chromaticity. Results obtained with white targets suggest that these searches are mediated by an achromatic mechanism in which the signals are independent of the chromaticity of the stimuli. Results obtained with reddish and bluish targets suggest that searches for those targets may be mediated by mechanisms tuned to both chromaticity and luminance. Further experiments in which observers searched for targets that differed from distractors in both chromaticity and luminance provided additional support for the second conclusion.

© 2000 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1720) Vision, color, and visual optics : Color vision
(330.5510) Vision, color, and visual optics : Psychophysics

History
Original Manuscript: June 14, 1999
Revised Manuscript: November 3, 1999
Manuscript Accepted: November 17, 1999
Published: March 1, 2000

Citation
Allen L. Nagy and Marc Winterbottom, "The achromatic mechanism and mechanisms tuned to chromaticity and luminance in visual search," J. Opt. Soc. Am. A 17, 369-379 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-3-369

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