The investigators compiled demographic, clinical, and neurocognitive data on all patients who had received TMS for any reason in the clinic over a 12-year period. Of 236 patients receiving TMS, 59 patients with AD and 14 with MCI satisfied study criteria and were compared to controls from the National Alzheimer's Coordinating Center (NACC). Neurocognitive outcomes were compared between magnetic resonance imaging (MRI) and electroencephalogram (EEG)-grid guided TMS in patients. Tolerability data was reviewed for all patients.