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The electrical excitability of the dark-adapted eye was measured by a single pulse of varying durations after exposure to light. The effect of the light was expressed by ζ, percentage increase of electrical excitability over the resting level. 1. After the eye was illuminated by white light for two seconds, ζ values were maximal 1, 1.5, and 2 seconds respectively after termination of the light stimulus as the duration of test pulse was 3-10, 20-32, and 60-200msec. In comparison with the data obtained with colored pre-illumi-nations and a sufficiently long electric test pulse the result was so inter-preted that the red, the yellow, and the green receptors were selectively excited by the pulses of 3-10 msec, by those of 20-32 msec. and by those of 60-200 msec. respectively. 2. ζ values measured at 1, 1.5, 2 and 3 seconds after termination of the white light were plotted against the duration of the test pulse, and it was found that ζ values were independent of the duration of the test pulse over a range from 80-125 msec. It is likely that the selectively excitatory action of an electric pulse upon color receptors is much weaker in the range of duration around 100msec. than in the range of shorter durations. 3. The dependence of the scotopic processes upon the duration of the test pulse was studied, and it was found that the duration of about 20msec. was most favorable for the rod process in agreement with the data by Yonemura and Nango.

Effects of the Duration of the Electric Test Pulse upon the Zeta-Value of the Human Retina