Figure 1.

Device and paradigm: (A) A photograph of the neurostimulator used in the study. The device has a processor and stimulator attached to a ring shaped radio frequency (RF) link. There is a trifurcated electrode array, with each electrode having a small tip for insertion. Each tip has 3 stimulation sites. (B) Device dimensions and design. (C) Tip dimensions and design. Red arrow denotes the distal stimulation site. (D) Paradigm for stimulus presentation. Animals tracked a point target, which was stepped to different locations. The stimulation was triggered either on the target step (before saccade) or on the resulting saccade (after saccade). The target was eliminated for 500 ms after the stimulation onset. Traces, from top to bottom are the 50 ms stimulation train, horizontal eye position (light blue) and horizontal target position (black), vertical eye position (dark blue), and vertical target position (black), horizontal eye velocity (light blue), vertical eye velocity (dark blue). Vertical lines denote electrically elicited eye movement onset.