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Rapid force production in the cochlea.

D C Mountain1, A E Hubbard

  • 1Department of Otolaryngology, Boston University, MA 02215.

Hearing Research
|November 1, 1989
PubMed
Summary

Electrical stimulation of the cochlea generates acoustic emissions, potentially from outer hair cells. Concurrent sounds can enhance these emissions, offering insights into auditory system mechanics.

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Otoacoustic Emissions

Background:

  • Electrical stimulation of the cochlea elicits mechanical responses.
  • These responses generate acoustic signals at the electrical current's frequency.
  • Electrically-evoked acoustic emissions (EEAEs) can reach significant amplitudes (up to 34 dB SPL).

Purpose of the Study:

  • To investigate the origin and characteristics of electrically-evoked acoustic emissions.
  • To explore the effect of concurrent acoustic stimuli on EEAEs.
  • To determine the temporal properties of the force-generating mechanism in the cochlea.

Main Methods:

  • Electrical stimulation of the mammalian cochlea.
  • Measurement of acoustically-evoked emissions.
  • Comparison with cochlear microphonic (CM) responses.
  • Frequency response analysis.

Main Results:

  • Electrically-evoked acoustic emissions were observed.
  • Concurrent acoustic stimuli enhanced the emission response.
  • The enhancement pattern suggests outer hair cell (OHC) origin for EEAEs.
  • Frequency response measurements indicated a force-generating time constant < 35 microseconds.

Conclusions:

  • Electrically-evoked acoustic emissions are a measurable phenomenon in the cochlea.
  • Outer hair cells are likely the source of these emissions.
  • The force-generating process within OHCs is rapid, with a time constant under 35 microseconds.

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