At each of the three testing phases, participants attended two individual 4–5 hour laboratory sessions; one with alcohol, the other placebo, in randomized order and under double blind conditions. Sessions were conducted in a comfortable living-room like environment, separated by at least 24 hours. The sessions were identical except for the alcohol content of the beverage, 0.8 g/kg alcohol (adjusted for sex), or placebo with a 1% alcohol taste mask. Upon arrival, objective breath tests confirmed compliance with recent alcohol abstinence, and a urine sample was collected for women to verify non-pregnancy. Subjective, objective and breathalyzer tests were obtained throughout the session (for more details, see Suppl. Methods).
