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On Go Trials (66.7% of trials), participants were instructed to execute a button press corresponding to the direction of the presented arrow. On Stop Trials (33.3% of trials), participants were instructed to withhold a button press if the circle turned red. The Stop Signal Delay (SSD; initial = 150 ms) was increased by 50 ms after each successful Stop trial and decreased by 50 ms after each unsuccessful Stop trial (i.e. false alarm).
