A long-term study suggests that daily exposure to 40Hz light and sound stimulation could help slow cognitive decline in individuals with late-onset Alzheimer’s disease. Over a two-year period, participants receiving the treatment maintained better cognitive function compared to typical Alzheimer’s patients and exhibited reduced levels of tau protein, a key biomarker of the disease.

The noninvasive approach—called GENUS—aims to synchronize brain activity with a 40Hz gamma rhythm using coordinated light and sound pulses. Although the therapy appeared less effective in early-onset cases, researchers emphasize its promise as a safe, home-based option for potentially delaying Alzheimer’s progression.

Key Findings:

• Sustained Cognitive Benefits: Participants with late-onset Alzheimer’s maintained higher cognitive test scores and reported improved sleep quality over two years.
• Reduced Biomarkers: Two patients experienced notable declines in plasma tau levels, which are associated with Alzheimer’s pathology.
• Safe and Practical: The GENUS 40Hz light-and-sound therapy was well tolerated and suitable for daily use at home.

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