Stiles’s middle-wave color mechanism Pi-4 is field additive for mixtures of 410-, 480-, 530-, 622-, and 670-nm adaptation fields, when studied with a 1-deg, 200-msec, 500-nm foveal test flash at 10 times absolute threshold.
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Number of runs, each providing five thresholds. Within-run standard deviation (SD), 0.04; between-run SD, 0.08; standard error of difference, 0.04. M = (A + B)/2.
N, Number of runs, each providing five thresholds. M = pA + (1 − p)B; p = 0.72 for AR, 0.65 for JS. Within-run SD, 0.05; between-run SD, 0.08; standard error of difference, 0.04.
Number of runs, each providing five thresholds. Within-run standard deviation (SD), 0.04; between-run SD, 0.08; standard error of difference, 0.04. M = (A + B)/2.
N, Number of runs, each providing five thresholds. M = pA + (1 − p)B; p = 0.72 for AR, 0.65 for JS. Within-run SD, 0.05; between-run SD, 0.08; standard error of difference, 0.04.