Causal Role of Brain Networks in Episodic Memory

Inclusion Criteria: * Ages 18 to 35 years old * Fluent in English * Free of major neurological or psychiatric illness * Right-handed * Normal or corrected to normal vision Exclusion Criteria: * History of a psychiatric illness within the past two years * History of a learning disorder (e.g., attention deficit disorder, dyslexia) * History of neurological disorder or brain injury, including family history of epilepsy, convulsions or seizures, stroke; vascular, traumatic, tumoral, infectious, or metabolic lesion of the brain, even without a history of seizure, and without anticonvulsant medication, and any unexplained lifetime loss of consciousness/syncope * Use of medications that reduce seizure threshold (e.g., tricyclic antidepressants, neuroleptic agents) * History of neurosurgery * History of heart disease * Recreational drug use in the past two months * Uncontrollable shaking, or inability to sit/lie still for one hour * Evidence of neurological disorders or structural abnormalities, based on MRI * Pregnancy * Prior surgeries, conditions, and/or implants that are not MRI-safe, including: pacemaker, pacemaker wires, artificial heart valve, brain aneurysm surgery, middle ear implant, non-removable hearing aids, braces, or extensive dental work, implanted mechanical or electrical device, artificial limb or joint * Foreign metallic objects in the body, such as bullets, BBs, shrapnel, or metalwork fragments * History of metal work or ocular metallic foreign bodies * History of uncontrolled migraines or susceptibility to headaches * Use of centrally-acting medications and drugs, with the exception of caffeine, within the last 12 hours * Concurrent treatment with ototoxic medications * Current sleep deprivation, extreme fatigue, or recent jet lag * Claustrophobia * Pre-existing noise induced hearing loss * Any prior adverse experience (e.g. physical or psychological discomfort) with repetitive TMS or MRI scanning