Because when confronted with absolute or even near silence, human brains and ears react in some pretty weird ways—ways that can result in a wide range of bizarre sonic experiences.
This article defines sound and examines what an experience of true silence might be like. Sound is a physical and psychological experience. If the brain goes without stimuli, it will produce its own in the form of hallucinations.
Silence seems to have the opposite effect of the brain to noise. While noise may cause stress and tension silence releases tension in the brain and body. A study published in the journal Heart discovered that two minutes of silence can prove to be even more relaxing than listening to "relaxing" music. They based these findings of changes
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why does silence feel loud