FIGURE 2.

(A) Schematic diagram of the task. Each trial started with a 3 s center-hold period, followed by a 1–1.5 s cue period in which 1, 2, or 3 cues (empty circles) indicated the possible locations of the upcoming target. At the end of the cue period, one of the cues became the target (filled circle), and the subject reached it as rapidly and accurately as possible using a joystick-controlled cursor. (B) Cue configurations used in the experiment. They consisted of all possible combinations of 1, 2, and 3 cues at 3 locations (i.e., 45°, 165°, and 285°). The targets were equally represented at all 3 locations, and the order of the trials was pseudo-randomly mixed.