Fig. 2.

Firing rate for displays of varying stimuli. (A) Schematic diagram of the monkey brain highlighting areas where recordings were performed. Recordings in dorsolateral prefrontal cortex (PFC) sampled areas 8 and 46. AS, arcuate sulcus; PS, principal sulcus. (B) PSTH represents mean population activity obtained during presentation of varying stimuli. (C and D) Mean firing rate is shown, averaged across displays of different numbers of stimuli, during the cue period (C) and the delay period (D). Data from two monkeys (n = 111 neurons that were selective to the stimuli during the cue period or the delay period). Bars represent SEM.