Fig. 5.

Microstimulation can cause pursuit in the direction opposite to the actual motion of the target. For all the trials shown, the target moved in the null direction. The position traces (A, B) show the eye position along the preferred–null axis, with downward deflections indicating null direction motion. C, Average eye speed in the direction of target motion as a function of time. The thick straight lines indicate the position and motion of the target.Inset in A, Location of the receptive field (circle, 24.6° to the right, 7.3° up) and the preferred direction (arrow, 0°) at this site. The receptive field diameter was 13.2° (shaded bars). The current level was 80 μA. The speed tuning of this site was not tested. No Stim, Nonstimulated trials;Stim, stimulated trials.