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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. 5 — May. 1, 2000
  • pp: 846–857

Technique to investigate the temporal phase shift between L- and M-cone inputs to the luminance mechanism

Sei-ichi Tsujimura, Satoshi Shioiri, Yuzo Hirai, and Hirohisa Yaguchi  »View Author Affiliations


JOSA A, Vol. 17, Issue 5, pp. 846-857 (2000)
http://dx.doi.org/10.1364/JOSAA.17.000846


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Abstract

We describe a technique to estimate the intrinsic phase shift between long-wavelength-cone (L-cone) and middle-wavelength-cone (M-cone) signals in the luminance mechanism with minimal contamination by chromatic mechanism(s). The technique can also estimate, simultaneously with the phase shift, the weight ratio of L and M cones for the luminance mechanism. We measured motion identification thresholds for a 1.0 cycle/deg, 12.0-Hz sinusoidal grating representing different vector directions in L- and M-cone contrast space. The physical phase of the L- and M-cone signals was varied over a broad range between -150 deg and +150 deg to investigate the effect on the threshold contours. The slope of the threshold contour in cone contrast space varied as a function of the physical phase. Estimates of the intrinsic phase shift between L and M cones are based on the change in slope of the threshold contour. The estimates are consistent with previous reports and show that whereas the L-cone signal lags behind the M-cone signal by ∼35 deg for an orange background, the M-cone signal lags behind the L-cone signal by ∼8 deg for a green background.

© 2000 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
(330.1880) Vision, color, and visual optics : Detection

History
Original Manuscript: July 21, 1999
Revised Manuscript: January 3, 2000
Manuscript Accepted: January 19, 2000
Published: May 1, 2000

Citation
Sei-ichi Tsujimura, Satoshi Shioiri, Yuzo Hirai, and Hirohisa Yaguchi, "Technique to investigate the temporal phase shift between L- and M-cone inputs to the luminance mechanism," J. Opt. Soc. Am. A 17, 846-857 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-5-846

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