FIG. 8.

SNr stimulation alters visually guided saccade latency. A: the cumulative proportion of saccades across all stimulation sites is plotted against saccade latency (ms) for the data collected while recording from SC neurons located on the same side as the SNr stimulation (uncrossed). The black lines show the cumulative proportions for the no-stimulation trials. The blue lines show the cumulative proportions for the stimulation trials. B: the same as in A except for the trials in which the SNr stimulation occurred on the side contralateral to the recorded SC neuron. C: the mean of the SDs of the saccade latencies measured across trials with stimulation of the SNr plotted against the mean of the SDs of the saccade latencies measured on trials without SNr stimulation. Each point is the mean computed from a single experiment and represents ≥10 trials. The red circles show the data obtained from trials in which the SC neurons recorded were on the same side as the SNr stimulation (20 uncrossed neurons). The black circles show the data obtained from trials in which the SC neurons recorded were on the opposite side as the SNr stimulation (18 crossed neurons). The oblique dashed line is the line of unity. Points falling below the line indicate reduced SDs in the stimulated trials. Only the neurons with statistically significant changes in neuronal activity during SNr stimulation as determined by ROC and the permutation test (see text) are shown.