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Related Concept Videos

The Cochlea01:13

The Cochlea

46.8K
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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Perceiving Loudness, Pitch, and Location01:21

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Sound source localization patterns and bilateral cochlear implants: Age at onset of deafness effects.

Sean R Anderson1, Rachael Jocewicz2, Alan Kan3

  • 1Waisman Center, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.

Plos One
|February 8, 2022
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Summary

Early bilateral hearing is crucial for individuals with bilateral cochlear implants (BiCIs) to accurately determine sound location. Factors like age and early deafness onset negatively impact sound localization performance in BiCI users.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Sound source localization is vital for daily functioning but impaired in patients with bilateral cochlear implants (BiCIs).
  • Patient factors such as auditory deprivation, experience, and age influence localization performance in BiCI users.
  • Characteristic localization errors are observed in BiCI patients, with limited investigation into their relationship with patient-specific factors.

Purpose of the Study:

  • To investigate the relationship between patient-dependent factors and sound localization errors in individuals with BiCIs.
  • To characterize specific error types using a novel machine learning approach.
  • To determine the impact of early bilateral hearing on sound localization outcomes.

Main Methods:

  • Sound localization performance was assessed in 48 participants with BiCIs using free-field pink noise trains.
  • Multiple analysis types were employed to understand localization errors and their correlation with patient factors.
  • A machine learning approach was utilized to categorize and interpret localization error patterns.

Main Results:

  • Older age at testing and earlier onset of deafness correlated with increased average localization error, especially for sounds near the head's center.
  • Machine learning analysis indicated greater response variability in individuals with earlier deafness onset compared to later onset.
  • Results align with previous research linking age and deafness duration to auditory processing deficits.

Conclusions:

  • Early bilateral hearing is essential for optimal sound source localization abilities in individuals with BiCIs.
  • Auditory deprivation and age significantly affect localization acuity and response consistency.
  • The findings highlight the importance of early intervention and rehabilitation for improving spatial hearing in BiCI users.