Chinese researchers have found that 40-hertz sound therapy significantly boosts brain waste clearance in primates, offering hope for Alzheimer’s treatment
KUNMING: A team of Chinese scientists has discovered that non-invasive sound therapy could offer new hope for treating Alzheimer’s disease, after tests on aged monkeys showed promising and long-lasting effects. The findings, led by researchers at the Kunming Institute of Zoology (KIZ), were published in the latest issue of the Proceedings of the National Academy of Sciences (PNAS).
The therapy uses a 40-hertz auditory tone, a low-frequency hum that falls within human hearing range. Previous research in mice suggested this frequency helps the brain clear out beta-amyloid proteins — the toxic plaques linked to Alzheimer’s. But this new study marks the first time similar benefits have been observed in non-human primates, a major step closer to human application.
The team conducted the study on nine aged rhesus monkeys, whose brains naturally develop Alzheimer’s-like plaque buildup. The monkeys were exposed to the sound for one hour daily over a week. After the treatment, the levels of Alzheimer’s-related proteins in their cerebrospinal fluid (CSF) more than doubled, indicating a significant increase in waste clearance from the brain.
“Most remarkably, the effect persisted,” said Hu Xintian, a researcher at KIZ. “When we measured five weeks after the sound treatment ended, the beneficial change had not faded.” This durability makes the treatment especially promising, given that current Alzheimer’s medications can be costly and carry potential side effects such as brain swelling.
Sound therapy, on the other hand, offers a safe, low-cost, and non-invasive approach. Researchers believe it could one day serve as an accessible physical treatment for Alzheimer’s, especially in its early stages. The team emphasised that more research is needed before it can be tested on humans, but the results in primates mark a critical breakthrough.
Alzheimer’s disease affects millions worldwide, with no known cure. Current treatments mainly aim to slow its progression. The possibility of using a simple tone to reduce harmful brain protein levels opens up an entirely new direction in neurological therapy.
The full study and supporting data can be accessed via the official PNAS platform or the Chinese Academy of Sciences.
