Prefrontal Theta Burst Stimulation to Improve Cognitive Impairment After ICU Delirium

Inclusion Criteria: * Eligible individuals must have experienced an ICU admission with documented delirium (confirmed via documented Confusion Assessment Method for the ICU score12 \[CAM-ICU\] or Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition13(p5) \[DSM-5\] criteria) * Age 50 to 75 years old * 3 months post-ICU discharge at time of enrollment (defined as within 90 ± 14 days) * English fluency * Family or close friend for collateral * Community-dwelling status * Montreal Cognitive Assessment14 score between 18 and 25. Exclusion Criteria: * Diagnosis of mild cognitive impairment or dementia (prior to delirium episode) * Seizure disorder * Other significant neurologic disease (e.g., Parkinson's, Huntington's, Normal pressure hydrocephalus, tumor, progressive supranuclear palsy, multiple sclerosis, hematomas, traumatic or anoxic brain injury) * Structural CT/MRI with evidence of infection or other clinically significant focal lesions (cortical strokes not large enough to distort anatomy and/or multiple lacunar infarctions ≤ 1.5cm and/or extensive white matter disease are allowed) * Unstable or decompensated cardiac disease (e.g., \<3 months myocardial infarction, unstable angina, decompensated congestive heart failure NYHA class 3-4) * Pacemaker * Cochlear implants * Implanted medication pumps * Intracranial metal implants * Previous TMS treatment * Pregnancy (negative urine or serum b-HCG or history of prior surgical sterilization or post-menopausal status \[12 months or more of amenorrhea\]) * Current depressive disorder (Beck Depression Inventory score15 \<13) * History of suicide attempts * Schizophrenia * Bipolar disorder * Alcohol or substance abuse * Severe visual/hearing impairment. * Informant Questionnaire on Cognitive Decline in the Elderly16 (IQCODE) score ≥3.4 (suggesting prior cognitive decline)