Eligibility Criteria:
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