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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 16, Iss. 3 — Mar. 1, 1999
  • pp: 436–442

Input of long- and middle-wavelength-sensitive cones to orientation discrimination

Sophie M. Wuerger and Michael J. Morgan  »View Author Affiliations

JOSA A, Vol. 16, Issue 3, pp. 436-442 (1999)

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Orientation discrimination thresholds for Gabor stimuli as a function of spatial frequency [0.6, 1, 2, or 4 cycles per degree (cpd)] and contrast were determined for several directions in the color plane spanned by the long-wavelength-sensitive (L) and medium-wavelength-sensitive (M) cones. For Gabor stimuli with carrier frequencies of 2 or 4 cpd we do not find a systematic and robust advantage of a particular color direction in the LM-cone plane when the stimuli are equated in terms of the sum of the absolute L- and M-cone contrasts. Luminance (L+M) and equiluminant (L2M) stimuli of identical overall L- and M-cone contrast yield identical orientation discrimination thresholds for the 2-cpd stimuli for the entire available contrast range (1–11%). For the very-low-spatial-frequency stimuli, orientation discrimination thresholds are lower for equiluminant stimuli than for luminance stimuli of the same cone contrast; for 4 cpd, orientation discrimination thresholds are slightly higher for equiluminant red–green stimuli than for luminance-defined stimuli.

© 1999 Optical Society of America

OCIS Codes
(330.1070) Vision, color, and visual optics : Vision - acuity
(330.1720) Vision, color, and visual optics : Color vision
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.6130) Vision, color, and visual optics : Spatial resolution
(330.7310) Vision, color, and visual optics : Vision

Original Manuscript: October 19, 1998
Revised Manuscript: November 17, 1998
Manuscript Accepted: November 2, 1998
Published: March 1, 1999

Sophie M. Wuerger and Michael J. Morgan, "Input of long- and middle-wavelength-sensitive cones to orientation discrimination," J. Opt. Soc. Am. A 16, 436-442 (1999)

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