Phosphene patterns.

Numeric details of the experimental parameter of phosphene count. Electrode spacing refers to the distance between electrode tips implanted in LGN tissue in a 3D regular grid pattern that will produce a center-weighted phosphene pattern in visual space [27]. Total electrode count includes electrodes that will generate phosphenes anywhere in the entire visual field, most of which would not be active in the Primary experiment, whereas the count within 10 degrees is for those electrodes generating phosphenes that lie within the central part of visual space corresponding to the approximate location of the letterform stimuli in this report.