Stochastic independence of color-vision mechanisms confirmed by a subthreshold summation paradigm.
We have used a subthreshold summation protocol to analyze spatial color-color interaction. By means of a CRT color monitor, we measured the threshold contours for a spatial frequency of 0.5 cycles/degree. Heterochromatic flicker photometry was used to obtain isoluminance. The results suggest that the blue-yellow (b-y) and red-green (r-g) contrast thresholds remained unchanged by the addition of fixed r-g and b-y subthreshold pedestals. Our subthreshold summation data then support the stochastic independence of colorvision mechanisms derived from Mullen and Sankeralli's work [Vision Res. 39, 733 (1999)] despite the differences that exist between the two experimental methods.
García
J A
JA
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, Spain. jgarcia@ugr.es
Nieves
J L
JL
Valero
E
E
Romero
J
J
D003118:Color Perception / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D012684:Sensory Thresholds; D013269:Stochastic Processes