The sound can reach the inner ear by two different paths, which may in turn affect what we perceive. The sounds are transmitted to the air driven through the ear canal, eardrum and middle ear to the cochlea, a spiral filled with liquid that is in the inner ear . In contrast, bone-borne sound reaches the cochlea directly through the tissues of the head. As he spoke, the sound energy is spread through the air around us and reaches the cochlea through the outer ear by air conduction. But the sound also travels directly from the vocal cords and other structures to the cochlea, and mechanical properties reinforce head low frequency vibrations, more serious tone. The voice you hear when you talk about is the combination of sound transmitted by both routes. When we hear a recording of our own voice, eliminating the bone conduction path, which we consider part of our voice "normal", and only hear the airborne component, alone, that is unfamiliar. We can experience the opposite effect plugged ears, with what can only hear the vibrations conducted by the bones.
Some people have inner ear abnormalities, which enhance the sensitivity to internal transmission component, the sound of his own breathing find it overwhelming, and may even hear the movement of their eyes in their sockets.
Thimoty E. Hull. Faculty of Medicine, Washington University, St. Louis.
article published in Scientific American No. 390
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