Temporal

contrast sensitivity to through the primate retina. A linear systems model was used to describe the temporal amplitude sensi-the cones. It was adjusted to reduce the effects of gap junction input and then applied as input to a model tic more than a 2 foveal field in a surround (de Lange, 1954). Nonetheless the transition from low-pass, low frequency cut-off TCSF at low retinal illuminance to band-pass, high frequency cut-off TCSF at high retinal illuminance was still present. A second technique, also introduced by de Lange (1958) and Kelly (1974), used stimuli varying sinusoidally in chromaticity at a constant ret