RecruitingDevice studyImproving Memory in Alzheimer's Disease With Noninvasive Brain StimulationThe investigators will evaluate the theory that Alzheimer's disease-related memory impairment derives from the inefficient orchestration of rhythmic activity at the level of large-scale cortical networks. The results as expected to elucidate AD-related pathophysiology and set groundwork for the development of drug-free interventions for improving memory in AD and related dementias.