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Electrically evoked response recorded with scalp electrodes from a single retinal prosthesis implant subject who is blind from retininitis pigmentosa. The traces were recorded 3 weeks apart. In both cases, eight electrodes were activated simultaneously to obtain an adequate signal. The average of 100 presentations is shown. Scale for both plots, 40 ms/div on x-axis, 4.88 μV/div on y-axis.
