For the behavioral measure of risk-taking, we analyzed the mean target number of pumps across balloons (i.e., BART score) as the primary independent variable. The effect of alcohol was assessed with independent samples t tests. Moreover, we stratified the BART into three different blocks, corresponding to the number of pumps for each group of 20 of the 60 balloons. This measure reveals whether there was a strategy shift during the task as a function of Group (alcohol versus placebo) and was assessed with a 3 × 2 repeated measures analysis of variance (ANOVA), with Block (pumps 1–20, pumps 21–40, and pumps 41–60) as within-subject factor and Group (alcohol versus placebo) as between-subject factor.
