Fig. 1.

Memory-guided saccade task. The monkey fixated on a central (0.6° x 0.6°) red square fixation point on a dark background. Following a variable time delay, a peripheral gray target (1° x 1°) appeared on one of eight equally spaced positions on an imaginary circle of eccentricity 12°. The target was extinguished after 100 ms of its appearance. The monkey continued to fixate on the central fixation point for 1,000 ms (±15% jitter). When the central fixation spot was extinguished, the monkey made a single saccade (yellow trace) to the remembered target location (shown as an unfilled dashed gray square).