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A, Injection of SCH 23390, a D1 receptor blocker, during the second subjective day (arrow; 0850 hr) does not affect the amplitude of the b-wave. B, SCH 23390 does not affect the spectral sensitivity of the retina (open diamonds) that remains in the cone-dominated daytime state. The criterion response was 10 μV (n = 3). C, SCH 23390, injected during the day, does not affect the intensity–response function.Symbols, asterisks, error bars, and the light cycle are described in Figure 2.
