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Cochlear Mechanics, Otoacoustic Emissions, and Medial Olivocochlear Efferents: Twenty Years of Advances and Controversies Along with Areas Ripe for New Work

Chapter
Part of the Springer Handbook of Auditory Research book series (SHAR, volume 50)

Abstract

Reviewed are progress, exciting new developments, and areas that need work. Topics considered are: Cochlear amplification is from energy injected into the traveling wave by outer-hair-cell somatic motility. Calcium-activated stereocilia motility does not work at high frequencies because of the slowness of calcium binding and unbinding. Cochlear mechanics and micromechanics in the apical half of the cochlea are different from in the base. Cochlear micromechanics and the multiple fluid drives to inner hair cell (IHC) stereocilia. Interaction of the multiple IHC fluid drives can explain phase reversals in auditory nerve fiber responses without phase reversals in basilar membrane responses. The mechanisms by which medial olivocochlear (MOC) efferents change cochlear mechanics and micromechanics. The generation mechanisms for otoacoustic emissions (OAEs). Distortion product OAEs (DPOAEs) travel backward by slow traveling waves. Stimulus frequency OAEs (SFOAEs) arise mainly from near the peak of the traveling wave. Using OAEs to reveal cochlear properties. Cochlear tuning is sharper in humans than in cats, guinea pigs, and chinchillas. Measuring MOC effects using changes in OAEs and the need for high OAE signal-to-noise ratios. MOC effects in humans. The role of MOC efferents in hearing. MOC activity makes it easier to hear signals in noise. MOC activity and selective attention. MOC activity reduces acoustic trauma.

Keywords

Basilar Membrane Acoustic Trauma Inner Hair Cell Reticular Lamina DPOAE Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by NIH NIDCD RO1 000235 and RO1 005977.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Eaton Peabody LabMassachusetts Eye and Ear InfirmaryBostonUSA
  2. 2.Department of Otology and LaryngologyHarvard Medical SchoolBostonUSA

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