In the SST, both drinkers (52.3 ± 2.8%) and non-drinkers (50.8 ± 2.6%) succeeded in approximately half of the stop trials. Drinkers and non-drinkers did not differ in the median go trial reaction time (623.4 ± 98.6 vs. 591.3 ± 112.0 ms; p = 0.1077, two-sample t test) or stop signal reaction time (SSRT, 203.5 ± 39.3 vs. 209.1 ± 39.4 ms; p = 0.4518, two-sample t test). Stop error reaction time was significantly shorter than to go trial reaction time (tdrinkers = 3.9004, p = 0.0002; tnondrinkers = 3.1635, p = 0.0020), suggesting that their performance was well tracked by the staircase procedure.
