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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 11, Iss. 6 — Jun. 1, 1994
  • pp: 1697–1709

Detection and discrimination of moving stimuli: the effects of color, luminance, and eccentricity

Andrew B. Metha, Algis J. Vingrys, and David R. Badcock  »View Author Affiliations

JOSA A, Vol. 11, Issue 6, pp. 1697-1709 (1994)

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Psychophysical detection and direction discrimination thresholds for 1c/°, 1-Hz Gabors are plotted in a Weberian long–middle-wavelength-sensitive cone contrast plane. The shape of these threshold contours suggests linear cone contributions to additive (ΔL/Lb + ΔM/Mb) and opponent (ΔL/Lb – ΔM/Mb) postreceptoral mechanisms. The opponent mechanism dominates thresholds at the fovea, but sensitivity decreases rapidly with eccentricity in comparison with the additive mechanism. Cone contributions to the mechanisms vary in a small and nonsystematic manner across the retina. The experiments show that the additive mechanism is directionally sensitive at detection threshold. At all eccentricities studied (0–24°), 0.3-log-unit suprathreshold contrasts are necessary for the opponent mechanism to signal direction of motion.

© 1994 Optical Society of America

Original Manuscript: September 17, 1993
Revised Manuscript: December 6, 1993
Manuscript Accepted: December 14, 1993
Published: June 1, 1994

Andrew B. Metha, David R. Badcock, and Algis J. Vingrys, "Detection and discrimination of moving stimuli: the effects of color, luminance, and eccentricity," J. Opt. Soc. Am. A 11, 1697-1709 (1994)

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