Optimizing Transcranial Magnetic Stimulation for Stimulant Use Disorder

Inclusion Criteria: * Age 18 or older * Ability to provide consent and comply with all study procedures. * Meets Diagnostic and Statistical Manual of Mental Disorders criteria for StUD (As assessed by MINI and self-report; Participants may have current comorbid drug use, but primary diagnosis must be StUD; does not apply to healthy control participants). * At least 2 weeks of abstinence from substance use (other than caffeine or nicotine). * Intention to remain in an addiction treatment program until intervention completion (does not apply to healthy control participants). * Confident level of English language proficiency. Exclusion Criteria: * Any organic brain disorder (e.g. TBI, stroke). * Head injury resulting in skull fracture or loss of consciousness exceeding 30 minutes. * TMS contraindication (history of seizures, metallic cranial plates/screws or implanted device). * MRI contraindications (unapproved metallic implants, pacemakers or any other implanted electrical device, shrapnel, metallic braces, non-removable body piercings, pregnancy, breathing or movement disorder, claustrophobia). * Any psychotic disorder (Participants with other treated and stable psychiatric disorders will be included). * Presence of a condition that would render study measures impossible to administer or interpret. * Primary current substance use disorder diagnosis on a substance other than stimulants or cocaine, except for caffeine or nicotine. * Greater than 9 months abstinence from substance use (does not apply to healthy control participants). * Pregnancy or breastfeeding.