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Related Concept Videos

The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Related Experiment Video

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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

Localization cues with bilateral cochlear implants.

Bernhard U Seeber1, Hugo Fastl

  • 1Institute for Human-Machine-Communication, Technische Universität München Arcisstr. 21, 80333 München, Germany. seeber@ihr.mrc.ac.uk

The Journal of the Acoustical Society of America
|February 6, 2008
PubMed
Summary

Individuals with bilateral cochlear implants (CIs) primarily use interaural level differences (ILDs) for sound localization. Envelope interaural time differences (ITDs) play a limited role, with ILDs dominating spatial hearing perception in CI users.

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Last Updated: Jul 7, 2026

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Published on: June 21, 2024

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Bilateral cochlear implants (CIs) can restore hearing but spatial perception remains a challenge.
  • Previous studies indicate excellent horizontal sound localization in some bilateral CI users.
  • Understanding the specific acoustic cues utilized is crucial for improving CI technology.

Purpose of the Study:

  • To investigate the specific localization cues (interaural time differences - ITDs and interaural level differences - ILDs) used by bilateral CI subjects with superior localization abilities.
  • To determine the relative contribution of envelope ITDs versus ILDs in sound localization with bilateral CIs.

Main Methods:

  • Experiment 1: Free-field localization of sounds with varying spectral and temporal characteristics (wide-band noise, low-pass noise, high-pass noise).
  • Experiment 2: Manipulating the head shadow effect by altering processor positions and introducing a divider.
  • Experiment 3: Localization in virtual space with controlled manipulation of ILDs and ITDs.

Main Results:

  • Localization of wide-band noise was not significantly affected by envelope pulsation, indicating limited contribution of envelope ITDs.
  • Low-pass noise localization was dependent on cutoff frequency, further suggesting limited ITD role.
  • Localization was consistently reliant on ILDs, especially when the head shadow effect was manipulated or removed.
  • Virtual space experiments confirmed that ILD variations caused predominant shifts in perceived location, even with high-pass noise.

Conclusions:

  • Sound localization in individuals with bilateral CIs, particularly those with high performance, is predominantly mediated by interaural level differences (ILDs).
  • Envelope interaural time differences (ITDs) contribute minimally to the localization capabilities of these CI users.
  • Findings emphasize the importance of ILDs for spatial hearing and suggest potential targets for optimizing CI processing strategies.