Figure 1. Task Structure.

The task included reward and no-reward conditions, each of which consisted of 2 blocks with 200 trials per block and a short break in between. During the reward condition, a red box appeared when an error occurred indicating no points were earned on the trial and a green box appeared for a correct response indicating 2 points were earned on the trial. During the no reward condition, a yellow box appeared regardless of the accuracy of the response and no points could be earned during the no reward condition. During both conditions, the words ‘Too Slow!’ appeared on the screen if the participant's response exceeded their individualized response deadline indicating that no points were earned. The timing of each component of the trial was identical across conditions: (a) stimulus (150 ms), (b) variable blank response screen (1200-1600 ms), (c) feedback (300 ms), and (d) variable ITI (1000-1400 ms).