Pink noise, a soothing alternative to white noise, is gaining attention for its potential benefits in promoting relaxation and improving sleep quality.
You may have heard of white noise used to mask background sounds. Now, it has colorful competition. There’s a growing buzz around pink noise, brown noise, green noise — a rainbow of soothing sounds — and their theoretical effects on sleep, concentration and relaxation response.
To understand pink noise, start with white, the most familiar of the color noises. White noise is similar to static on a radio or TV. Sound engineers define it as having equal volume across all the frequencies audible to the human ear. It gets its name from white light, which contains all the visible color wavelengths. But the high frequencies of white noise can sound harsh.
White noise and pink noise may provide small benefits for people with attention-deficit/hyperactivity disorder, according to a recent review of limited ADHD studies. In theory, it wakes up the brain, said ADHD researcher and co-author Joel Nigg of Oregon Health & Science University in Portland. 'The noise provides stimulation to the brain without providing information, and so it doesn’t distract,' Nigg said.
Pink noise has a frequency profile 'very similar to the distribution of brain wave frequencies we see in slow-wave sleep because these are large, slow waves,' said Dr. Roneil Malkani, assistant professor of neurology at Northwestern University Feinberg School of Medicine. If Northwestern’s research pans out, it could lead to a medical device to improve sleep or memory through personalized pulses of pink noise. But many scientific questions remain unanswered, Malkani said.
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