Fig. 12.

Rebound saccade when the stimulation frequency is reduced. Spatial trajectory (A and B) and time course of the horizontal velocity (C and D) of saccades evoked at sites i10 (100 ms, 2T = 40 μA) and e25 (100 ms, 2T = 60 μA) are shown with different stimulation frequencies (red, 100 pps; blue, 200 pps; orange, 400 pps; green, 600 pps). At a high frequency of stimulation (400 and 600 pps), an ipsilateral saccade is first evoked, followed by a rebound saccade. At a lower frequency of stimulation (100 and 200 pps), the ipsilateral saccade has disappeared. A contralateral saccade is evoked with a latency that is timed to the stimulation offset. Note at site i10 the “counter-rebound” saccade (negative velocity values in C), which is absent at site e25 (D).