Figure 1.

Stop-signal task. A, Participants had to rest their right index finger on a switch. On a computer screen, a bar started to fill at a constant and equal rate, crossing a red horizontal target line at 800 ms. The color of the bar was light blue, dark blue, or magenta for the 0%, 20% and 40% stop-signal probability, respectively. B, In go trials, participants had to stop the indicator as close as possible to the red target. The bar could be stopped by lifting the finger/releasing the switch. C, In stop trials, the bar would stop filling before it reached the target line. Participants had to cancel the movement of lifting their finger/releasing the switch.