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Neurophysiological studies have demonstrated that in primates Magno and Parvo neurons have distinct contrast gain properties. Reaction Times (RTs) can be used to study supra-threshold contrast coding in humans over the same range of stimulus parameters. RTs to achromatic sinusoidal gratings were measured for a range of spatial frequencies (0.49 -17.7 c/degree), stimulus luminances (0.005-20 cd/m 2 ) and contrasts (from threshold to 0.5). The stimuli subtended an angle of 7.2°at a viewingdoi:10.1016/s0028-3932(00)00100-7 pmid:11074078 fatcat:yxzklkedlvgvbnnabltzmyig4i