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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Model predictions for bone conduction perception in the human.

Stefan Stenfelt1

  • 1Department of Clinical and Experimental Medicine, Linköping University, 581 85 Linköping, Sweden.

Hearing Research
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

Inner ear inertia is the primary driver of bone conducted (BC) sound, though middle ear and inner ear compression also contribute significantly across frequencies. Other pathways play minor roles, especially at higher frequencies.

Keywords:
Bone conductionFluid inertiaInner ear compressionInner ear modelMiddle ear inertia

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Biomedical Engineering

Background:

  • Bone conducted (BC) sound perception involves multiple auditory pathways.
  • The relative contributions of these pathways remain incompletely understood.

Purpose of the Study:

  • To investigate the relative importance of five proposed BC sound pathways.
  • To model the inner ear's response to BC stimulation using acoustic impedance.

Main Methods:

  • Developed an acoustic-impedance model of the inner ear.
  • Incorporated data on BC-generated ear canal sound pressure, middle ear ossicle motion, cochlear promontory vibration, and intracranial sound pressure.
  • Simulated BC stimulation at the mastoid across a frequency range of 0.1-10 kHz.

Main Results:

  • Inner ear inertia was the dominant cochlear excitation pathway.
  • Inner ear compression and middle ear inertia contributed significantly (within 10 dB) across most frequencies.
  • Ear canal sound pressure had minimal contribution at low/high frequencies and moderate contribution at mid frequencies.
  • Intracranial sound pressure contribution decreased with increasing frequency.

Conclusions:

  • Inner ear inertia is the most critical pathway for BC sound excitation.
  • Middle ear and inner ear compression are important secondary contributors.
  • The developed model accurately predicts AC stimulation up to 4 kHz, highlighting frequency-dependent pathway contributions in BC hearing.