Craving & Decision-Making

Inclusion Criteria: * At least 18 years of age * Willingness to follow study requirements, as evidenced by an ability to provide written informed consent and read, understand, and complete the study procedures * Minimum of 6th grade reading level Additional inclusion criteria for participants with OUD: * Primary diagnosis of OUD encompassing heroin and/or painkiller use * Receiving medications for OUD treatment on an outpatient basis * At least 12-month history of opioid use Exclusion Criteria: * Unable to speak or read English * Active psychosis or mania * Current or past schizophrenia diagnosis * History of intellectual disability or developmental or neurological disorder, seizures or epilepsy, or loss consciousness lasting more than 30 minutes * Severe medical conditions requiring hospitalization or that, in the opinion of the study staff could compromise study participation * MRI contraindications (claustrophobia, nonremovable piercings, certain metal in the body etc.) or pregnancy Additional exclusion criteria for community control participants: * Positive urine drug screen * Current or past problematic substance use other than nicotine, and alcohol abuse confined to college or military service * Current or past bipolar disorder diagnosis * Use of central nervous system medications within the past 6 weeks (e.g., antidepressants, Ritalin)