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Equivalent luminance contrast of red-green drifting stimuli: Dependency on luminance-color interactions and on the psychophysical task

The equivalent luminance contrast (EqLC) of red-green drifting stimuli was assessed by 3 independent methods. The 2 authors and 3 naive observers were Ss in 3 experiments. Method A consisted in adjusting the luminance contrast of a yellow, equichromatic stimulus to match the direction-discrimination performances that were obtained with a red-green, equiluminant stimulus. Method B was a replica of the standard motion-cancellation technique proposed by P. Cavanagh et al (1984). Method C consisted in adjusting the luminance contrast of the same yellow, equichromatic stimulus as in Method A to match the perceived speed of the red-green, equiluminant stimulus. The 3 estimated EqLCs are all different. Differences between EqCLs assessed by means of Methods A and C reveal unequal transfer efficiencies from the directional to the speed-processing stages in the chromatic and achromatic pathways. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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