New findings contradict a prevailing belief about the inner ear

A healthy ear emits soft sounds in response to the sounds that travel in. Detectable with sensitive microphones, these otoacoustic emissions help doctors test newborns' hearing. A deaf ear doesn't produce these echoes.

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<p><a href="http://www.physorg.com/news122049885.html">New findings contradict a prevailing belief about the inner ear</a></p> <p>A healthy ear emits soft sounds in response to the sounds that travel in. Detectable with sensitive microphones, these otoacoustic emissions help doctors test newborns' hearing. A deaf ear doesn't produce these echoes.</p>