Figure 1.

Calculation of stop-signal RT (SSRT) according to the race model (Logan and Cowan, 1984). The black curve depicts the distribution of RTs on go trials (i.e., trials without a stop-change signal) representing the finishing times of the go process. Assuming independence of the go and stop processes, the finishing time of the stop process bisects the go RT distribution. Given that the response could not be stopped on nth percent of all stop-change trials (here at 50%), SSRT (200 ms) is calculated by subtracting the mean stop-change signal delay (100 ms) from the 50th percentile of go RT (300 ms).