Brown note

The brown note (sometimes brown tone or frequency) is a fictional infrasonic frequency capable of causing fecal incontinence by creating acoustic resonance in the human bowel. Considered an urban myth, the name is a 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 Hz, which are below the lower frequency limit of human hearing. High-power sound waves below 20 Hz are felt in the body.

The brown note (sometimes brown tone or frequency) is a fictional infrasonic frequency capable of causing fecal incontinence by creating acoustic resonance in the human bowel. Considered an urban myth, the name is a 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 Hz, which are below the lower frequency limit of human hearing. High-power sound waves below 20 Hz are felt in the body. ==Physiological effects of low frequency vibration== Air is a very inefficient medium for transferring low frequency vibration from a transducer to the human body. Mechanical connection of the vibration source to the human body, however, provides a potentially dangerous combination. The U.S. space program, worried about the harmful effects of rocket flight on astronauts, ordered vibration tests that used cockpit seats mounted on vibration tables to transfer "brown note" and other frequencies directly to the human subjects. Very high power levels of 160 dB were achieved at frequencies of 2–3 Hz. Test frequencies ranged from 0.5 Hz to 40 Hz. Test subjects suffered motor ataxia, nausea, visual disturbance, degraded task performance and difficulties in communication. These tests are assumed by researchers to be the nucleus of the current urban myth. ==See also== Acoustic resonance The Mosquito – A commercial device that deters loitering by emitting sound with a very high frequency The Republic XF-84H – An experimental aircraft that produced enough noise to cause headaches, nausea and seizures among its ground crew Tesla's oscillator – A vibrating machine which is claimed to have the effect of a "mechanical laxative", causing subjects to run straight to the bathroom after use "World Wide Recorder Concert" – A South Park episode involving a fictional brown note

Text derived from https://en.wikipedia.org/w/index.php?oldid=1371772452 under CC BY-SA 4.0; modifications have been made.