Detection mechanisms in L-, M-, and S-cone contrast space.
Detection thresholds were obtained for a 2 degrees Gaussian-blurred spot flashed for 200 ms on an 8.9 degrees white adapting field of 1070 trolands. The spot's contrast was represented in an L-, M-, and S-cone contrast space. Detection thresholds were obtained for many vectors close to specific but theoretically important planes within this space. A three-dimensional surface was fitted to the data generated by the probability summation of three mechanisms, each a weighted sum of cone contrasts. The fit revealed a red-green chromatic mechanism driven by delta L/L--delta M/M with no S-cone input that was 1 order of magnitude more sensitive than the two other mechanisms. The latter consisted of a luminance mechanism with little S-cone input and a blue-yellow chromatic mechanism with the S cone opposed to L and M cones.
Cole
G R
GR
Centre for Visual Sciences, Australian National University, Canberra.
Hine
T
T
McIlhagga
W
W
D003118:Color Perception / Q000502:physiology; D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D008297:Male; D008433:Mathematics; D010786:Photoreceptor Cells / Q000502:physiology*; D012684:Sensory Thresholds; D014796:Visual Perception / Q000502:physiology*