We know from daily experiences that visual sensations persist for some time following any momentary stimulation of light to the retina,-a fact generally known as "after-image."After-images are classified into positive and negative, but little has hitherto been known about the exact time relation of these phenomena, because both the beginning and the end of sensations are difficult to be marked. The following is the record of our experiments carried out for the measurement of the details of time relation comprised in the phenomena of after-image and the endurance of consciousness.
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