Figure 5.

Movement-related activity on canceled trials. A, Spike density functions for canceled trials (red) and latency-matched no-stop signal trials (black) showing no significant difference for one SMA cell for movements to the right and left targets. The first dotted line represents the SSD. The second dashed line represents the SSRT. B, Activity from a pre-SMA cell showing a difference in activity on latency-matched no-stop signal and canceled trials for the first SSD for movements to the right and left. Cancelation time occurs after the SSRT boundary for both plots. The response time distribution and inhibition function for the recording session are shown below. The inhibition function is estimated using a Weibull (dotted line) and monotonic spline (solid line) fit. Mean response time, 448 ms; SSRT, 150 ms. The arrowheads mark the average time of movement start and end. The range is indicated by the gray bar. The red and black boxes above each plot indicate the type of trial, the target location, and the movement direction (for no-stop signal trials).