What is pink noise? The frequency that can improve sleep, memory and cognitive function
The background sound-masking effects of white noise are well known. Regular travellers wear white noise headphones to block out the hubbub on a packed aeroplane, while light sleepers and parents with newborns invest in white noise machines to stop outside sounds from waking them or the baby up. While white may be the most well-known noise frequency colour, new research at the Massachusetts…
Pink noise is a type of sound that has a unique frequency distribution, with relatively more low-frequency energy and equal power in each octave. Unlike white noise, which sounds like radio static, pink noise has a softer, wind rustling through leaves or waves washing up on a beach quality. This distinct sound is believed to promote deep sleep, improve memory, and enhance cognitive function.
In a recent study at the Massachusetts Institute of Technology, researchers discovered that short bursts of pink noise during sleep can strengthen cerebrospinal fluid (CSF) waves, which are responsible for washing away waste products in the brain. By stimulating blood vessels during these slow brain waves, pink noise creates a pump-like effect that pushes CSF out of the brain along with harmful proteins.
This process could potentially slow the progression of neurodegenerative diseases like Alzheimer's, Parkinson's, and Huntington's.
While each color of noise has its own characteristics and uses, pink noise is particularly effective in promoting restorative sleep and improving cognitive function. However, the effectiveness of noise varies from person to person, depending on individual preferences and specific goals. For instance, white noise might be more suitable for masking intermittent environmental sounds, while pink noise is ideal for promoting deep sleep and memory enhancement.
It is essential to keep the volume at a comfortable level to avoid discomfort and potential hearing risks.
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