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Equiluminance: Spatial and temporal factors and the contribution of blue-sensitive cones.

Determined equiluminance ratios for red/green, red/blue, and green/blue sine-wave gratings by using a minimum-motion heterochromatic matching technique that permitted reliable settings at temporal frequencies as low as 0.5 Hz in 2 experiments with 3 Ss. The red/green equiluminance ratio was influenced by temporal but not spatial frequency, the green/blue ratio was influenced by spatial but not temporal frequency, and the red/blue ratio was influenced by both. The inhomogeneity of yellow pigmentation within the macular region was identified as the source of the spatial-frequency effect on the blue/green ratio. Although effects of spatial and temporal frequency appeared to be consistent across observers, there were substantial differences in mean equiluminance settings between individuals. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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