Editing Brown note (section)

{{Short description|Urban myth}}
{{Distinguish|Brownian noise}}

The '''brown note''' (sometimes '''brown tone''' or '''frequency''') is a hypothetical [[Infrasound|infrasonic]] frequency capable of causing [[fecal incontinence]] by creating [[acoustic resonance]] in the human bowel. Considered an [[urban myth]], the name is a [[metonymy|metonym]] for the common color of human [[faeces]]. Attempts to demonstrate the existence of a "brown note" using sound waves transmitted through the air have failed.

Frequencies supposedly involved are between 5 and 9 [[Hertz|Hz]], which are below the lower frequency limit of [[hearing range#Humans|human hearing]]. High-power sound waves below 20 Hz are felt in the body.