Childhood Trauma Questionnaire (CTQ): Since childhood trauma has been shown to affect corticolimbic brain activity and corticolimbic brain activity following OT administration we will use the CTQ to assess childhood trauma exposure in each of the study participants. The CTQ is a 25-item self-report questionnaire used to assess the extent to which individuals have childhood abuse and neglect. Subjects answer each question using a 5-point Likert scale ranging from (1) never true to 5 (very often true). The reliability and validity of the CTQ have been tested in both healthy and substance-dependent populations.