The Chicago Social Drinking Project was approved by The University of Chicago Institutional Review Board, and all participants provided written informed consent. Of the initial 196 participants who attended at least 1 laboratory session, 190 completed all 3 sessions and therefore comprised the sample for the study. Laboratory sessions were conducted from March 2004 to July 2006, with all follow-ups completed by July 2008. Inclusion criteria were age 21 to 35 years; a body mass index (calculated as weight in kilograms divided by height in meters squared) of 19 to 30; good general health with no current or past major medical or psychiatric disorders, including alcohol and substance dependence; and no current medications that would interact with study procedures. Participants were selected to belong to 1 of 2 distinct drinking groups on the basis of established guidelines for heavy/binge and light drinking3,35,48 and to be consistent with prior studies.21,49–51 These groups were heavy drinkers (HD; n=104 [44 women]) and light drinkers (LD; n=86 [41 women]). Criteria for the HD group were (1) consuming at least 10 but no more than
