Figure 1.

Prosaccade and antisaccade paradigm. A, Four task conditions. Fixation point color indicates monkeys to perform a prosaccade (look toward a stimulus) or an antisaccade (look away from the stimulus). “Contra” and “Ipsi” indicate saccade directions. B, Event time course. After fixation point appearance, monkeys acquire the fixation point and generate a saccade in response to stimulus appearance. The fixation point disappeared 200 ms before stimulus appearance. On randomly chosen 50% of trials, microstimulation was delivered from 200 ms before stimulus appearance to saccade initiation.