Visual Beats Caused by Simultaneous Electrical and Photic Stimulation

Abstract
Os were employed in a series of experiments undertaken to discover some of the conditions under which visual beats, produced by simultaneous photic and electrical stimulation of the eye, occur. Beat frequency is found to equal the difference between the frequencies of the 2 component stimuli, to be independent of stimulus intensity, and to occur in the frequency range of 5 to 45 cps and with a maximal difference of 4 cps between the frequencies.
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