Figure 1. Task and behavioural performance.

(a) Frames represent sequence of events in the ODR task. The monkey is required to observe a cue stimulus, maintain fixation during a delay period and, when the fixation point turns off, saccade to the remembered location of the cue. (b) Sequence of events in the ODR with distractor task. After the cue appearance and delay period, a distractor stimulus, which needs to be ignored, appears at a location diametric to the cue. The monkey is still required to saccade to the remembered location of the cue. (c) Possible locations of the stimulus presentation on the screen. (d) Performance in the ODR task, during neural recording sessions. Proportion of correct trials is plotted for each monkey, excluding trials that were aborted before the end of the delay period due to breaks in fixation. Young and adult sessions are represented in blue and red, respectively (n=134 sessions for young, 178 for adult). (e) Performance for the ODR with distractor task (n=32 sessions for young, 54 for adult).