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Chromatic discrimination in the presence of incremental and decremental rod pedestals

Published online by Cambridge University Press:  03 July 2008

DINGCAI CAO ,
ANDREW J. ZELE  and
JOEL POKORNY
DINGCAI CAO
Affiliation:
Visual Science Laboratories, Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois
ANDREW J. ZELE
Affiliation:
School of Optometry and the Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
JOEL POKORNY*
Affiliation:
Visual Science Laboratories, Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois
*
Address correspondence and reprint requests to: Joel Pokorny, Visual Science Laboratories, The University of Chicago, 940 East 57th Street, Chicago, IL 60637. E-mail: [email protected]
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Abstract

Signals from rods can alter chromatic discrimination. Here, chromatic discrimination ellipses were determined in the presence of rod incremental and decremental pedestals at mesopic light levels. The data were represented in a relative cone Troland space, normalized by discrimination thresholds measured along the cardinal axes without a rod pedestal. In the quadrant of cone space where L-cone relative to M-cone excitation increased, and S-cone excitation decreased, rod incremental pedestals degraded chromatic discrimination, and rod decremental pedestals improved chromatic discrimination. Discrimination in the other three quadrants of cone space was unaffected by the incremental or decremental rod pedestals. A second experiment measured chromatic discrimination under conditions where cone pedestals were matched to the appearances of the incremental and decremental rod pedestals. Based on the matching pedestal data, discrimination then could be measured independently along the cardinal axes using either chromatic [L/(L + M); S/(L + M)] or luminance (L + M) pedestal components. The discrimination data altered by the rod pedestals were similar to chromatic cone pedestals for L/M increment discrimination, but similar to luminance cone pedestals for S decrement discrimination. The results indicated that the rod and cone signals combined differently in determining chromatic discrimination for different post-receptoral pathways.

Keywords

Chromatic discriminationRod pedestalMesopicRod-cone interactionPost-receptoral pathways
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 3 , May 2008 , pp. 399 - 404
Copyright
Copyright © Cambridge University Press 2008

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