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Related Experiment Video

Updated: Jul 23, 2025

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
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Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

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Inter-aural separation during hearing by bilateral bone conduction stimulation.

Sudeep Surendran1, Stefan Stenfelt1

  • 1Division of Sensory Organs and Communication (SOK), Department of Biomedical and Clinical Sciences (BKV), Campus US, Linköping University, Linköping 581 85, Sweden.

Hearing Research
|July 18, 2023
PubMed
Summary

Bone conduction (BC) hearing has inherent cross-head transmission, limiting binaural performance. This study quanties this crosstalk using a novel cancellation technique, revealing frequency-dependent effects on sound localization.

Keywords:
Bone conductionCross-head transmissionCross-talk cancellationEar canal sound pressure

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Hearing Science

Background:

  • Bone conduction (BC) hearing's binaural performance is limited by cross-head transmission, unlike air conduction (AC).
  • Understanding and quantifying this crosstalk is crucial for improving BC hearing devices and auditory perception research.

Purpose of the Study:

  • To investigate and quantify the prominence of cross-head transmission in bone conduction hearing.
  • To develop and apply a cancellation method to measure ipsilateral cochlear excitation via bilateral BC stimulation.

Main Methods:

  • A cancellation experiment was performed on 20 normal-hearing participants across 13 third-octave frequencies (250-4000 Hz).
  • Stationary and transient BC stimulation at the mastoid was used, employing multi-stage masking for precise level and phase adjustments.
  • Ear canal sound pressure was measured during ipsilateral, contralateral, and bilateral BC stimulation at perceptual cancellation.

Main Results:

  • Inter-aural level differences were consistent across stimulation types.
  • Crosstalk was lowest around 2 kHz and highest around 1 kHz.
  • Inter-aural phase difference increased with frequency, and cycle-adjusted inter-aural time difference varied, peaking at 800 Hz.
  • Ear canal sound pressure cancellation did not occur at the same phase as cochlear sound cancellation.

Conclusions:

  • The study successfully quantified bone conduction crosstalk using a novel cancellation technique.
  • Findings highlight frequency-dependent characteristics of BC crosstalk, impacting binaural hearing and sound localization.
  • The phase difference between ear canal pressure and cochlear sound at cancellation indicates complex transmission pathways.