Abstract
We have studied psychophysically the characteristics of the postreceptoral stage of visual processing, using heterochromatic brightness matching (HBM) between 540 and 600 nm, and hue discrimination between 565 and 585 nm, under differing luminance flicker (0-30 Hz) and excitation purity (1.0-0.1) conditions. The HBM curves exhibit deeper minima around 575 nm with decreasing purity. The minimum is generally most pronounced with a 3 Hz flicker and least pronounced with a 30 Hz flicker. Hue discrimination ability is relatively insensitive to flicker and deteriorates at the lower purities. The HBM results for low purities can be explained by the upper envelope of activities in PC- and MC-pathways.
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