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Related Concept Videos

Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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The Cochlea01:13

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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

Updated: May 2, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

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Single-Sided Deafness and Cochlear Implants: Performance in a Novel Combined Speech-in-Noise and Localization Task.

Nadine I Ibrahim1, Obada Abdulrazzak, Chioma Anidi1

  • 1Department of Otolaryngology-Head & Neck Surgery, University of Michigan, Ann Arbor, Michigan.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|July 21, 2025
PubMed
Summary

Single-sided deafness (SSD) impairs speech-in-noise and sound localization. Cochlear implants (CI) improve speech performance, but head movements may offer further adaptive benefits for individuals with SSD.

Keywords:
Binaural hearingCochlear implantHead movementSSDSingle-sided deafnessSound localizationSpeech-in-noise

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Single-sided deafness (SSD) presents significant challenges in auditory perception, affecting sound localization and speech comprehension in noisy environments.
  • Compensatory head movements are a known adaptation strategy for individuals with hearing impairments.

Purpose of the Study:

  • To analyze the impact of SSD on listening behavior, including sound localization and speech-in-noise performance.
  • To quantify and compare compensatory head movements in individuals with normal hearing (NH) and SSD, with and without a cochlear implant (CI).

Main Methods:

  • A prospective study involving participants with NH, SSD, and SSD with CI.
  • Subjects performed speech-in-noise and sound localization tasks in a controlled acoustic environment while head movements were monitored.
  • Analysis focused on localization accuracy, speech-in-noise performance, and head movement metrics (displacement, onset delay, response time).

Main Results:

  • SSD subjects showed reduced accuracy in speech-in-noise and sound localization compared to NH controls.
  • Cochlear implantation provided limited benefit for sound localization but improved speech-in-noise performance, especially at optimal signal-to-noise ratios (SNRs).
  • Cochlear implant users exhibited shorter head movement response times, though onset delay and displacement did not differ significantly from SSD-only participants.

Conclusions:

  • Cochlear implants primarily enhance speech-in-noise performance for individuals with SSD.
  • While sound localization abilities exist, their clinical significance may be modest.
  • Adaptive head movement strategies could be leveraged through device programming or training to further improve auditory performance in SSD.