Alzheimer’s patients can present with impairments in brain waves, specifically in gamma-frequency oscillations in the range of 25–80 Hz, that are important for attention, perception, and memory.
In 2016, Iaccarino et al demonstrated that visual stimuli presented at 40 Hz, but not other frequencies reduced levels of beta-amyloid plaques in mice; beta-amyloid plaques are a pathogenic marker for Alzheimer Disease. However, the results were limited to the visual cortex.