marginally significantp < 0.06
However, despite the lack of a reference plane in depth, for all but Subject 1 (marginally significant) the observed SEM values for phosphene area were significantly smaller than SEM values from randomly chosen electrodes (Subject 1: p < 0.06, Subject 2: p < 0.01, Subject 3: p < 0.001, Subject 4: p < 0.001).