Scientists have discovered that a particular low-frequency sound can help the brain clear away toxic proteins linked to Alzheimer's disease - paving the way for a simple, non-invasive treatment for the most common form of dementia.
How it works?
It is a sound with a frequency of 40 Hz – a light and continuous noise, similar to the humming of a refrigerator.
In a recent study, researchers in China exposed elderly monkeys to this sound for an hour a day for a week. They then measured levels of the protein beta-amyloid, which is linked to Alzheimer's.
The result was surprising:
the level of this protein in the fluid surrounding the brain tripled
this suggests that it was leaving the brain and being "cleaned"
The effect lasted up to five weeks after the end of treatment.
The brain's "cleaning system"
The brain has a natural cleaning mechanism called the glymphatic system. It functions as a “laundry” that removes waste and harmful proteins.
This process is assisted by:
electrical brain waves (gamma waves)
which operate around a frequency of 40 Hz
In Alzheimer's, these waves weaken, causing:
the cleaning system slows down
toxic proteins accumulate and damage cells
Why is 40 Hz sound important?
Sound at this frequency is thought to:
synchronizes the electrical activity of the brain
restores the rhythm of gamma waves
reactivates the cleaning process
Previous studies have shown that this method can:
reduces beta-amyloid and tau proteins
improve memory (in animal models)
What is happening to people?
Research in humans is still in progress, but some results are promising.
An experimental device using 40 Hz sound and light:
used for an hour a day for 6 months
showed less brain shrinkage on scans
slowed the decline in memory and daily functions
However, researchers emphasize that the results are not yet conclusive and larger studies are needed.
Connection with hearing
Hearing loss is considered a significant risk factor for dementia.
Although hearing aids do not produce exactly 40 Hz frequency, they:
stimulate the brain with continuous sounds
can help maintain its activity
The possibility of integrating this frequency into headphones or hearing aids for everyday use is also being studied.
Should you try it yourself?
Experts are cautious:
The frequencies in the studies are accurate and controlled.
there is no evidence that “homemade” versions work
So, for now, this method remains promising, but still in the research phase.
A simple sound could have great potential for brain health, helping to clear proteins linked to Alzheimer's.
However, until there is stronger evidence, this approach should be seen as an interesting scientific development – not as a ready-made solution. /GazetaExpress/
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