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Related Concept Videos

Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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The Cochlea01:13

The Cochlea

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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: Oct 11, 2025

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Lateralization of interaural level differences in children with bilateral cochlear implants.

M Sparreboom1, S A Ausili2, E A M Mylanus1

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, Hearing and Implants, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, Netherlands.

Cochlear Implants International
|December 7, 2021
PubMed
Summary

Children with bilateral cochlear implants (BiCIs) perceive interaural level differences (ILDs) similarly to normal-hearing peers. However, longer delays between implants can negatively impact sound lateralization, though not localization ability.

Keywords:
Bilateral Cochlear ImplantsChildrenInteraural Level DifferenceLocalization

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Area of Science:

  • Audiology
  • Neuroscience
  • Pediatrics

Background:

  • Bilateral cochlear implants (BiCIs) aim to restore hearing in children.
  • Understanding interaural level difference (ILD) perception is crucial for binaural hearing and sound localization.
  • Investigating ILD perception in children with BiCIs is essential for optimizing auditory rehabilitation.

Purpose of the Study:

  • To compare interaural level difference (ILD) perception in children with BiCIs and normal-hearing children.
  • To examine the effect of intracranial shifts in ILD perception on sound localization in children with BiCIs.
  • To analyze the influence of factors like age, inter-implant delay, and preoperative hearing on ILD responses.

Main Methods:

  • Measured ILD responses across four frequency bands (broadband, low-pass, mid-pass, high-pass) in 9 children with BiCIs and 15 normal-hearing children.
  • Compared outcomes with previous localization studies using identical stimuli.
  • Analyzed the impact of chronological age, inter-implant delay, and preoperative residual hearing.

Main Results:

  • No significant differences in ILD responses were found between children with BiCIs and normal-hearing peers.
  • Children with sequential BiCIs showed a significant shift in broadband ILD responses towards the first implanted ear.
  • A significant correlation existed between inter-implant delay and the shift in ILD response for broadband and high-pass stimuli, but this did not affect localization.

Conclusions:

  • Children with BiCIs demonstrate comparable ILD perception to normal-hearing children.
  • Inter-implant delay negatively affects the lateralization of ILD responses, suggesting potential auditory deprivation.
  • Despite shifts in ILD lateralization, sound localization abilities remain unaffected in children with BiCIs.