This cohort will be drawn from a pre-existing cohort of individuals recruited as part of an already existing study, and who have been followed since birth. Reward processing will be measured in two temporally close testing sessions involving two methodologies, electrophysiology and fMRI. Information will also be collected pertaining to experimental and problematic drug use, as well as information about mood, at the recording sessions. Drug use and mood information will then be collected once again in quarterly follow-up sessions for one year. The goal is to examine if PCE status and reward processing are risk factors for problematic drug abuse and risky behaviors in emerging adulthood, and if these factors interact to increase such risk.