Making an effort to listen: mechanical amplification in the ear.

Abstract:

:The inner ear's performance is greatly enhanced by an active process defined by four features: amplification, frequency selectivity, compressive nonlinearity, and spontaneous otoacoustic emission. These characteristics emerge naturally if the mechanoelectrical transduction process operates near a dynamical instability, the Hopf bifurcation, whose mathematical properties account for specific aspects of our hearing. The active process of nonmammalian tetrapods depends upon active hair-bundle motility, which emerges from the interaction of negative hair-bundle stiffness and myosin-based adaptation motors. Taken together, these phenomena explain the four characteristics of the ear's active process. In the high-frequency region of the mammalian cochlea, the active process is dominated instead by the phenomenon of electromotility, in which the cell bodies of outer hair cells extend and contract as the protein prestin alters its membrane surface area in response to changes in membrane potential.

journal_name

Neuron

journal_title

Neuron

authors

Hudspeth AJ

doi

10.1016/j.neuron.2008.07.012

subject

Has Abstract

pub_date

2008-08-28 00:00:00

pages

530-45

issue

4

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(08)00584-9

journal_volume

59

pub_type

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