Figure 3.

Bar graphs represent the overall percentage of neurons that exhibited significant responses over the baseline period in either the cue or the delay period (left), in the cue period alone (middle) and in the delay period alone (right). Error bars represent standard error of the mean for percentages calculated separately in each monkey. Data are shown separately for each prefrontal region (N = 182 total neurons for posterior-dorsal, N = 757 for mid-dorsal, N = 360 for anterior-dorsal, N = 633 neurons for posterior-ventral, and N = 122 for anterior-ventral region). All line diagrams plotted represent significant differences between the corresponding bars, evaluated with a chi-square test (P < 0.05).