Monday, March 13, 2006

 

Ear's spiral responds to bass - New theory explains why our hearing machinery is coiled up.

"Why is our cochlea, the key organ of hearing, curled into a spiral? It has been often thought to be a space-saving measure. But researchers in the United States have shown that the spiral could be vital for increasing our ear's sensitivity to sound, particularly at low frequencies.

Daphne Manoussaki of Vanderbilt University in Nashville, Tennessee, and her colleagues believe that the snail-shell curve of the cochlea focuses sound waves at the spiral's outer edge, making it easier for vibration-sensitive cells to detect them1.

If the researchers are right, then the ear is more sophisticated than we thought. "

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