This study was approved by the University of Colorado Human Research Committee and all participants provided written informed consent after receiving a full explanation of the study. Inclusion criteria were the following: (1) age between 21 and 65; (2) a score of 8 or higher on the Alcohol Use Disorders Identification Test (AUDIT), indicating a hazardous drinking pattern (Allen et al., 1997); (3) self-reported current drinking of 6 or more drinks (4 or more for females) per week; this item was used to ensure that participants were current drinkers and not abstainers as a result of recent alcohol problems. Participants were recruited primarily from the University through advertisements and E-mails directed towards the University students and employees. A total of 124 participants met the screening criteria and completed an in-person assessment of demographics, drinking behavior, level of response to alcohol, and individual differences measures. Of the 124 participants in this study, 40 participants went on to complete a pharmacogenetic study of naltrexone (Ray and Hutchison, 2007). This study focuses on the sample of 124 (39 females) participants selected for a
