The bullroarer is a flat elliptical shaped piece of wood attached to a cord that produces a whirring trance inducing drone when whirled through the air. Universally linked to thunder and spirit beings in the sky, these roaring sticks are probably the most widespread among all sacred instruments. In the mid-1980s, acoustic scientists determined that bullroarers produce a range of infrasonics -- extremely low frequency sound waves (20 Hz or less) that are below the normal limit of human hearing, but nonetheless enter the brain. Thunder, earthquakes, waterfalls, waves, whales, drums, gongs, and chanting all generate infrasonics. These waves are picked up by the cochlea (labyrinth) of the ear and influence the circadian and vestibular systems of the brain. Infrasonics stimulate a wide range of euphoric, trance states. Watch my new YouTube video "Shamanic Journey Drumming & Bullroarer" and try a shamanic journey.
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