Chromatic discrimination in the presence of incremental and decremental rod pedestals
Cao, Dingcai, Zele, Andrew J., & Pokorny, Joel (2008) Chromatic discrimination in the presence of incremental and decremental rod pedestals. Visual Neuroscience, 25(3), pp. 399-404.
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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|Item Type:||Journal Article|
|Additional Information:||Supported by National Eye Institute grant EY00901-35, Australian Research Council Discovery Project DP0773544 and a Research to Prevent Blindness Challenge Grant. We thank Jules Quinlan for technical assistance with the optical system and Linda Glennie for technical assistance in computer programming.|
|Keywords:||Chromatic discrimination, Rod pedestal, Mesopic, Rod-cone interaction, Post-receptoral pathways|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Deposited On:||16 Apr 2009 15:18|
|Last Modified:||13 Nov 2012 08:46|
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