Fig. 2.

(A) Anatomical locations of recording sites. PS, principal sulcus; AS, arcuate sulcus. The recording sites cover areas 9/46d and 8b in the DLPFC (on the surface of the DLPFC slightly dorsal to the posterior principal sulcus). (B) Behavioral performance and spatial bias in the VH task of two monkeys. Behavioral performance is calculated as correct trials per total trials. Behavioral bias is calculated as the absolute value of (X − Y)/(X + Y), where X is the number of left choices, and Y is the number of right choices. (C) A histogram and rasters of a cell in the VH task show average neuronal activities in different task periods (bin size = 500 ms). The time-locking event for the histogram is the offset of the visual cue (Icon-off), the beginning of the delay period.