Fig. 2.

Task, stimuli and recording locations. (A) Task. At the beginning of each trial, one of three possible cue stimuli (here, a ribbon) was presented 6° to the left or right of the fixation point. The cue indicated the relevant hemifield for that trial and the target picture to be detected (flower basket). A sequence of stimuli followed in the cued location, consisting of 0–3 nontargets followed by the associated target. Monkeys were required to maintain central fixation until the target appeared, and then at target offset, to make an immediate saccade to its location for juice reward (black arrow; not present on actual display). (B) Cue–target pairs for one animal.