Figure 9.

Results of an experiment using three discrete delay-period durations: 30, 130, and 230 ms. Data are from 1 d using monkey G (39 isolations, 957 trials, same dataset as in Fig. 5B). Fixation was enforced near the central spot until after the go cue. A, Traces at top show the change in mean firing rate from baseline (±SE), across all isolations and target locations. Traces below show the NV ± SE. Analysis was performed with data aligned to the go cue. This means that, for each delay duration, analysis was also aligned to target onset, although that occurred at different times before the go cue. B, Mean RT versus the change in firing rate from baseline, measured at the time of the go cue for the three delay-period durations. Black symbols plot the mean change averaged across all neurons and conditions. Gray symbols plot the same analysis but including only the preferred condition of each neuron. Note that the x-axis has been rescaled in the latter case. C, Mean RT versus the NV, measured at the time of the go cue for the three delay-period durations. Error bars show SEs.