The experimental task was a go/no-go task similar to the design used by Roche and colleagues (2005), where two different white letters were displayed sequentially on a black background, and participants were asked to make a button press when the stimulus presented followed a different stimulus (go trials), but to withhold their response when the stimulus repeated the one that immediately preceded it (no-go trials; e.g., the fourth letter in the string H-K-H-H-K). No-go trials were pseudo-randomly interspersed throughout the task. Three blocks of 144 trials were completed, with 108 go trials and 36 no-go trials in each block (75% and 25%, respectively). The letters used were X-Y, O-P, and D-U, and a different pair was used for each block. Stimulus duration was 300 ms, the response window was 1150 ms, and the inter-trial-interval was 900 ms. Participants completed a set of 20 practice trials prior to recording, but no electrocortical data was recorded. After each block participants were presented with their overall accuracy and were allowed to rest until manually initiating the next block.
