To ensure safety, the participant was not allowed to drive after each session and was given a car service or other arranged transportation home. Participants were compensated $50 for each session and given a $50 bonus if they completed both sessions. These procedures were identical to those used with the original cohort, with the exception that the original sample also participated in a third randomized session that included a low dose of alcohol (0.4 g / kg). This dose was subthreshold to produce changes on most subjective and objective measures, so it was not administered in the second cohort. There were six and three participants in the first and second cohorts, respectively, who enrolled but did not complete all sessions, which resulted in N=104 for each cohort.
