Figure 1.

TMS-induced perturbations in horizontal saccades. A, Control saccades. Position and velocity of 15° horizontal saccades. B, A typical TMS saccade. The TMS pulse was given 5 ms after saccade onset. At ∼66 ms, the eyes pause, and after an additional 22 ms they resume their movement to the target. The small kink in the velocity profile immediately after TMS is an artifact of the TMS pulse. C, Position and velocity traces of saccades that paused with TMS. Blue vertical line denotes time of TMS. Occasionally the corrective movement produced an overshooting of the target. In this case, a second saccade at a latency of at least 150 ms produced a final correction. TMS was placed over the cerebellum for these data.