Fig. 4.

Microstimulation can alter the direction of pursuit and saccadic target velocity compensation. The trajectory of pursuit over the first 100 msec after the saccade to the target is shown for nonstimulated (No stim) trials inA and for stimulated (Stim) trials inB. The traces are aligned on the end point of the saccade in space. The saccadic target velocity compensation on stimulated (•) and nonstimulated (○) trials is shown inC. The target moved to the right at 25°/sec (arrow), and the preferred direction of this site was down and to the right (arrow). Inset inA, Receptive field location (circle, 10.8° to the left, 4.6° down) and preferred direction (arrow, 315°). The receptive field diameter was 11°, and the preferred speed was 25°/sec at this site. The current level was 40 μA on stimulated trials.