of frequencies as low as 5 Hz, attaining a level of 120 decibels of sound pressure at 9 Hz and up to 153 dB at frequencies above 20 Hz, but the rumored physiological effects did not materialize. The test subjects all reported some physical anxiety and shortness of breath, even a small amount of nausea, but this was dismissed by the hosts, noting that sound at that frequency and intensity moves air rapidly in and out of one's lungs. The show declared the brown note myth "busted". See also Acoustic resonance Feraliminal Lycanthropizer, a fictional psychotechnographic machine 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. "Worldwide Recorder Concert", a South Park episode involving a fictional Brown Note References Sound Urban legends Ultrasound Fictional energy weapons