Figure 2. Behavioral paradigm.

A. Random task. In the Random task, a visual cue is presented in pseudo random order 100 ms after the monkey’s touch on the monitor. B. Repeating task. In the Repeating task, a visual cue is presented according to a predetermined sequence (left panel). Right panel: As the monkey learns the sequence, the monkey started to touch the target in the sequence before the presentation of the visual cue. After extended practice, the monkeys perform the task without visual cues. C and D. Examples of three element sequences of the Repeating task.