Inclusion Criteria:  18 - 65 y.o. Meets criteria for an anxiety disorder (Generalized Anxiety Disorder, Panic Disorder, Social Anxiety Disorder, Specific Phobia), posttraumatic stress disorder, obsessive- compulsive disorder, or current adjustment disorder with anxiety Is currently seeking mental health treatment Is able to read consent document and provide informed consent. English is a first or primary fluent language.  Exclusion Criteria:  Current alcohol or substance use disorder of more than mild severity (as defined by DSM-5 and determined using standardized self-report instruments) Lifetime diagnosis of psychotic disorder or bipolar mania Presence of neurological disorder that contraindicates TMS or neurophysiological recording: Seizure disorder Lifetime history of traumatic brain injury with loss of consciousness Neurodegenerative disorder (e.g., Alzheimer's Disease, Parkinson's Disease, Frontotemporal Dementia) Presence of other medical disorder that would make it too uncomfortable to sit or lie still for long recording periods Presence of standard contraindications for MRI or rTMS Metal in the body Currently pregnant Claustrophobia Significant sensitivity to noise Medical conditions or treatments that lower seizure threshold History of severe brain injury History of seizures/ epilepsy Currently taking anticholinergic mediation, neuroleptic medication, or sedative/ hypnotic medication Note: SSRI, cholinesterase inhibitors or NMDA receptor antagonists are allowed if patient has been on a stable regimen of four weeks prior to enrollment Currently taking chronic opiate medications or substances Currently taking naltrexone