Evidence for luminance and quasi-sustained color mechanisms.
Reaction time distributions were determined in response to near-threshold intensity increments predicted to isolate either the opponent-color or luminance system. The reaction time histograms show a clear distinction between when the chromatic and achromatic systems detect the stimulus. Our results are consistent with previous reports suggesting the achromatic system is more sensitive to higher temporal frequencies than the chromatic system.
D003118:Color Perception / Q000502:physiology*; D006801:Humans; D008027:Light; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*