Why is it necessary?
All sounds stimulate the delicate bones located in the middle ear. Sometimes, when the eardrum is damaged, the bones of the middle ear can be stimulated by a vibrator located behind the ear at the base of the jaw.
Bone conduction of sounds works even through the teeth. When one American put a metal seal with a microscopic gap (simply put, with marriage), the tooth with the seal turned into an analogue of the detector radio.
As a result, the man began to hear voices in his head (radio broadcasts and talks on radiotelephones) and… go to a psychiatrist. Continue reading