Chromatic discrimination in the presence of incremental and decremental rod pedestals.

Chromatic discrimination in the presence of incremental and decremental rod pedestals. Research Abstract Details 

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Chromatic discrimination in the presence of incremental and decremental rod pedestals. Abstract Text:

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.

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MEDLINE DATE: 2008 May-Jun

Chromatic discrimination in the presence of incremental and decremental rod pedestals. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Visual neuroscience

VOLUME: 25

Page Numbers: 399-404

Journal Abbreviation: Vis. Neurosci.

ISSN: 1469-8714

DAY: 7

MONTH: 07

YEAR: 2008

Chromatic discrimination in the presence of incremental and decremental rod pedestals. Information

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LANGUAGE: eng

NlmUniqueID: 8809466

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Grant and Affiliation Information for Chromatic discrimination in the presence of incremental and decremental rod pedestals.

AFFILIATION: Visual Science Laboratories, Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois.

Country: England

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MEDLINETA: Vis Neurosci

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