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Histogram of the sustained component (see Results) of all magnocellular neurons, red–green opponent parvocellular neurons, and blue-on cells. A, Responses to luminance stimuli. B, Responses to cone-isolating stimuli for the dominant cone type (L cone for magnocellular, center cone for red–green parvocellular, S cone for blue-on). The three populations were nonoverlapping, whatever the stimulus type.
