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Posts: 27153
Jan 1 16 12:09 PM
The Death Rattle You Can’t Hear The chills down your spine…the heaviness in your chest…the feeling of deep and abiding dread. Sound like a horror movie? Maybe an encounter with a wayward spirit? It could be something far more subtle: infrasound. Infrasound is the name used to describe very low frequency sounds below the range of human hearing. Sounds in these frequencies can be produced naturally by events such as ocean waves, avalanches, earthquakes, volcanic activity and meteors. They can also be produced as a by-product of man-made events such as chemical and nuclear explosions, as well as being intentionally created for research purposes. Nature puts infrasound to good use. Migratory birds use it as a navigational aid, and whales use it to communicate over long distances. The animal kingdom may indeed also rely on infrasound to hone survival instincts. Ever heard of animals “predicting” events such as earthquakes? They may be picking up on infrasound waves. Infrasound has also made an appearance in urban legend with the “brown note“–the sound that supposedly forces humans to evacuate their bowels involuntarily. Rumors have long circulated that military agencies have been experimenting with just such a noise, but the accounts remain anecdotal. So far, evidence does not support the existence of such a bodily reaction; instead, infrasound more frequently produces psychic symptoms ranging from a sense of uneasiness to acute fear and dread, sometimes accompanied by visual hallucinations.
The chills down your spine…the heaviness in your chest…the feeling of deep and abiding dread. Sound like a horror movie? Maybe an encounter with a wayward spirit?
It could be something far more subtle: infrasound.
Infrasound is the name used to describe very low frequency sounds below the range of human hearing. Sounds in these frequencies can be produced naturally by events such as ocean waves, avalanches, earthquakes, volcanic activity and meteors. They can also be produced as a by-product of man-made events such as chemical and nuclear explosions, as well as being intentionally created for research purposes.
Nature puts infrasound to good use. Migratory birds use it as a navigational aid, and whales use it to communicate over long distances. The animal kingdom may indeed also rely on infrasound to hone survival instincts. Ever heard of animals “predicting” events such as earthquakes? They may be picking up on infrasound waves.
Infrasound has also made an appearance in urban legend with the “brown note“–the sound that supposedly forces humans to evacuate their bowels involuntarily. Rumors have long circulated that military agencies have been experimenting with just such a noise, but the accounts remain anecdotal. So far, evidence does not support the existence of such a bodily reaction; instead, infrasound more frequently produces psychic symptoms ranging from a sense of uneasiness to acute fear and dread, sometimes accompanied by visual hallucinations.
Read more @ http://www.area51.org/infrasound-what-you-need-to-know/
"What lies behind us and what lies before us are small matters compared to what lies within us." ~ Ralph Waldo Emerson ~
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