The sample consisted of 104 nonalcoholic heavy social drinkers (39 female) who were participants in the second cohort of the Chicago Social Drinking Project (CSDP) at the University of Chicago, tested from June 2009 to June 2011. All participants in the second wave of the CSDP were heavy drinkers, operationally defined as persons who consume five or more drinks on an occasion (four or more for women), one to five times on average per week as their predominant adult pattern. These criteria were chosen to be consistent with SAMHSA guidelines for heavy drinking (SAMSHA, 2005) and for comparisons across prior studies (King and Epstein, 2005; King et al., 2002; McKee et al., 2010) An additional criterion was employed to assure regular weekly alcohol consumption of at least 10 drinks per week, but no more than 40 drinks per week to avoid possible alcohol dependence and withdrawal or difficulties adhering to 48 hour alcohol abstention criteria before sessions. During in-person screening, participants completed demographic, background, and self-report alcohol measures, including the Alcohol Use Disorder Identification Test (AUDIT; Barbor et al., 1989),
