Reverse transduction measured in the living cochlea by low-coherence heterodyne interferometry.

Abstract:

:It is generally believed that the remarkable sensitivity and frequency selectivity of mammalian hearing depend on outer hair cell-generated force, which amplifies sound-induced vibrations inside the cochlea. This 'reverse transduction' force production has never been demonstrated experimentally, however, in the living ear. Here by directly measuring microstructure vibrations inside the cochlear partition using a custom-built interferometer, we demonstrate that electrical stimulation can evoke both fast broadband and slow sharply tuned responses of the reticular lamina, but only a slow tuned response of the basilar membrane. Our results indicate that outer hair cells can generate sufficient force to drive the reticular lamina over all audible frequencies in living cochleae. Contrary to expectations, the cellular force causes a travelling wave rather than an immediate local vibration of the basilar membrane; this travelling wave vibrates in phase with the reticular lamina at the best frequency, and results in maximal vibration at the apical ends of outer hair cells.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ren T,He W,Barr-Gillespie PG

doi

10.1038/ncomms10282

subject

Has Abstract

pub_date

2016-01-06 00:00:00

pages

10282

issn

2041-1723

pii

ncomms10282

journal_volume

7

pub_type

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