The averaged visual evoked potentials of 5 subjects were recorded during perception of a tachistoscopically presented stationary, vertical straight line. The subjects had been trained to experience movement of the stimulus, i.e., on each exposure of the straight line they experienced it as lengthening from the fixation area to full length and then shortening back to the fixation area. Subjects' frequencies of experience (duration of perception expressed in Hertz) were 2.4, 2.2, 2.4, 1.6, and 1.7, respectively. For 3 of the 5 subjects the averaged visual evoked potential contained an oscillation at a frequency similar to the subject's frequency of experience.
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