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

Andrew B. Metha; Algis J. Vingrys; David R. Badcock

doi:10.1364/JOSAA.11.001697

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

Andrew B. Metha, Algis J. Vingrys, David R. Badcock

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

Abstract

Psychophysical detection and direction discrimination thresholds for lc/°, 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 (DL/Lb + DM/Mb) and opponent (DL/Lb - DM/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.

Original language	English
Pages (from-to)	1697-1709
Number of pages	13
Journal	Journal of the Optical Society of America A: Optics and Image Science, and Vision
Volume	11
Issue number	6
DOIs	https://doi.org/10.1364/JOSAA.11.001697
Publication status	Published - 1 Jan 1994
Externally published	Yes

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title = "Detection and discrimination of moving stimuli: The effects of color, luminance, and eccentricity",

abstract = "Psychophysical detection and direction discrimination thresholds for lc/°, 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 (DL/Lb + DM/Mb) and opponent (DL/Lb - DM/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.",

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AU - Vingrys, Algis J.

AU - Badcock, David R.

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KW - Detection

KW - Eccentricity

KW - Luminance

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

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