Grand-average, visually evoked (left) and saccade-related (right) CSD from SEF. Nissl section from SEF in center indicates laminar architecture (adapted from Matelli et al., 1991 with permission). a, CSD recorded while monkeys passively viewed wide-field flashes of light. Four current sinks were observed and are numbered in order of appearance. b, CSD recorded while monkeys made spontaneous saccades in darkness. c, d, Data from a and b reproduced without interpolation highlighting time periods when channels deviate significantly from baseline (running Wilcoxon, p < 0.05 for > 5 consecutive 10 ms time bins). Sixteen channel depths are shown.