All participants under 18 years of age and their parents or guardians underwent written informed consent (or assent for minors) in accordance with the University of California, San Diego Human Research Protections Program. Participants over age 18 consented for their own participation, and their parents consented for a collateral interview. Teens were classified as: (1) binge drinkers (BG; n=14) with histories of at least one episode of ≥ 4 drinks on one occasion for females and ≥ 5 drinks for males; (2) binge drinkers and marijuana users (BG+MJ; n=14) with history of lifetime marijuana use between 180 to 1800 times and binge drinking history as above; and (3) control teens with very limited if any substance use history (CON, n=14). Groups were statistically similar on age, gender, household income, general intellect, externalizing and internalizing behaviors, and mood (see Table 1).
