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This study is a continuation of the author's work on the quantitative measurement of the pupillary reaction. By means of a refined apparatus he takes cinematographic pictures of the pupils under varying light conditions, with rigid control of other circumstances. If one eye is stimulated by exposure to light at regular intervals of from one to eleven seconds the pupillary reflex becomes fatigued. The more rapid the stimulation, the more rapid the fatigue. The fatigue is apparently of central origin, as it occurs even when the frequency of stimulation is extremely low. The intensity and duration of the stimulus seem to have little to do with the fatigue.
A remarkable circumstance is that the light reflex may become gradually or suddenly revived by psychic influences. Under these circumstances, all the steps of fatigue are retraced. The effective psychic influences may be either external or internal in origin. Repeated pleasurable stimulation
Der psychische Restitutionseffekt. Arch NeurPsych. 1940;43(5):1056. doi:10.1001/archneurpsyc.1940.02280050200019
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