Abstract
Changes in electrical excitability of the dark-adapted eye caused by a brief illumination with white light were measured under various conditions of intensity and duration of illumination. (1) It was confirmed that a flash of light was followed by an electrical refractory phase and an electrical supernormal phase successively, both extrema of refractoriness and of supernormality being reached in about 0.05'' and about 2'' after the end of illumination respectively. (2) The refractory period was found to be strikingly dependent on duration of illumination but far less on its intensity. (3) It was found that there exists a quantitative relation between refractoriness and supernormality. (4) It was pointed out that an increase in intensity does not always act in the same sense as an increase in duration of illumination.
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