Fig. 1.

Single-unit stability analysis. A: three attributes of an example unit: mean spike waveform (MSW), interspike interval histogram (ISIH), and baseline perievent spike rate (PESR). Events used for the PESR were the visual presentation of the peripheral target (cue), the movement onset (mvt), and the reward delivery (rew). The two vertical lines indicate the boundaries of the three perievent windows that comprised the PESR. B: the distributions of similarity statistics (Pearson's correlation coefficient for the MSW and PESR attributes; Kolmogorov–Smirnov statistic for the ISIH attribute) for all pairs of units recorded on different electrodes (black) and on the same electrode (gray). C: the probability that pairs of units recorded on the same electrode were the same unit. Dashed vertical line at P = 0.001 indicates the significance level.