Fig. 1.

Behavioral paradigms and the locations of recording sites. a In the self-timed saccade task, monkeys were trained to generate a self-initiated saccade to the location of a briefly presented visual cue (100 ms) after the mandatory delay interval (400, 1000, or 2200 ms). b In the conventional memory-guided saccade (MS) task, animals made a saccade in response to the fixation point (FP) offset that occurred 800–2500 ms after the visual cue. Each task condition was indicated by specific color and shape of the FP, and the stimulus set for monkey F is shown here. A different set of the FP color and shape was used for the other two monkeys (see Methods). The visual cue appeared 800–1700 ms following the onset of this instruction. c Distributions of self-timed saccade latency during LFP recording in three monkeys (n = 3225, 4373, and 4588 trials for monkeys G, B, and F, respectively). Inverted triangles indicate the minimal mandatory intervals to obtain reward. d Coronal MR image (AC + 2) and recording sites (red circles) in monkey F. Scale bar represents 5 mm. Recording sites were reconstructed from histological sections in monkey G (Supplementary Figure 1). AC, anterior commissure