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Study links low-frequency hearing to shape of the cochlea
Date:4/25/2008

reshold of 55 Hz. Similarly, the sea lion has a basilar membrane three times as long as that of the guinea pig. But its radii ratio is 5.2, lower than either the cat or the guinea pig, and it cannot make out sounds below 180 Hz. (This limit is for the sea lions hearing in air; under water it can hear down to 200 Hz.)

What I like about this is that a macroscopic feature of the ear has such a major effect on our hearing, says Manoussaki. As colleagues have pointed out, so much research today is done at the genetic and cellular level that you dont often see cases like this where simple geometry proves to be so important.


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Contact: David F. Salisbury
david.salisbury@vanderbilt.edu
615-343-6803
Vanderbilt University
Source:Eurekalert

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