"When the brain hears noise, such as the sound of rain, it relieves stress, helping us sleep better," according to Kimberly Hershenson, an anti-depression psychologist. For a sound to be called noise, it must be emitted continuously at the same sound intensity. The frequency doesn't matter, as long as the volume is uniform. Therefore, the sound of falling rain is also a form of interference at frequencies from 0-20 kHz.
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