S-cone discrimination in the presence of two adapting fields: data and model.
This study investigated S-cone discrimination using a test annulus surrounded by an inner and outer adapting field with systematic manipulation of the adapting l=L/(L+M) or s=S/(L+M) chromaticities. The results showed that different adapting l chromaticities altered S-cone discrimination for a high adapting s chromaticity due to parvocellular input to the koniocellular pathway. In addition, S-cone discrimination was determined by the combined spectral signals arising from both adapting fields. The "white" adapting field or an adapting field with a different l chromaticity from the other fields was more likely to have a stronger influence on discrimination thresholds. These results indicated that the two cardinal axes are not independent in S-cone discrimination, and the two adapting fields jointly contribute to S-cone discrimination through a cortical summation mechanism.
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D000221:Adaptation, Ocular / Q000502:physiology*; D003116:Color; D003118:Color Perception / Q000502:physiology*; D004192:Discrimination, Psychological; D006801:Humans; D008297:Male; D008954:Models, Biological; D010775:Photic Stimulation; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult