Figure 7.

Inhibition neurons. A, SMA cell with a possible role in stopping movement. Activity on canceled trials (red) and latency-matched no-stop signal trials (black) is shown demonstrating a larger canceled response. Response becomes significant after the SSRT. Mean response time, 406 ms; SSRT, 126 ms. B, Pre-SMA cell that could be involved in inhibiting movement. Cancelation time falls before the SSRT boundary. Cancelation time occurs before the SSRT boundary for leftward movements. Mean response time, 433 ms; SSRT, 116 ms. Conventions are as in Figure 5.