L and M cone relative numerosity and red-green opponency from fovea to midperiphery in the human retina.
The relative numerosity of the long-wavelength-sensitive (L) and middle-wavelength-sensitive (M) cones and the red-green color appearance, as assessed by means of unique yellow, are stable from fovea to midperiphery (+/- 28 deg nasotemporal). As foveal tests decrease in size, unique yellow progressively shifts toward longer wavelengths, favoring a model of red-green opponency carried by cells whose centers receive input from either L or M cones and whose surrounds receive mixed contributions from both. Individual differences in unique yellow over a 20-nm range and the relative numerosity of L and M cones can be linked by means of this model, suggesting that the relative number of L and M cones is a factor that regulates individual variations in red-green color appearance.
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Department of Cognitive Sciences, University of California, Irvine 92697, USA.
Cicerone
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D000328:Adult; D003116:Color; D003118:Color Perception / Q000502:physiology*; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008297:Male; D008954:Models, Biological; D012160:Retina / Q000502:physiology*; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology* / Q000502:physiology*