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Related Concept Videos

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.
44.9K

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Related Experiment Video

Updated: Jul 1, 2025

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

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Synchronizing Automatic Gain Control in Bilateral Cochlear Implants Mitigates Dynamic Localization Deficits

M Torben Pastore1, Kathryn R Pulling1, Chen Chen2

  • 1College of Health Solutions, Arizona State University, Tempe, Arizona, USA.

Ear and Hearing
|March 13, 2024
PubMed
Summary
This summary is machine-generated.

Synchronizing automatic gain controls (AGCs) in cochlear implants improved sound localization by reducing front-back reversals, especially when head movements were allowed. This restored performance to baseline levels when AGCs were not engaged.

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

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Independent left and right automatic gain controls (AGCs) in cochlear implants can distort interaural level differences.
  • This distortion compromises dynamic sound source localization and can lead to front-back reversals (FBRs).

Purpose of the Study:

  • To assess if synchronizing left and right AGCs mitigates localization difficulties.
  • To determine if synchronized AGCs improve listeners' ability to use head movements to avoid FBRs.

Main Methods:

  • 10 bilateral cochlear implant patients listened to broadband noise from six loudspeakers.
  • Tests were conducted with synchronized and independent AGCs at 70 dBA (above threshold) and 50 dBA (below threshold).
  • Listeners' ability to localize sound was tested under stationary and free head movement conditions.

Main Results:

  • Independent AGCs at 70 dBA increased FBRs compared to 50 dBA baseline.
  • Synchronizing AGCs with head movements reduced FBRs to baseline levels.
  • Synchronized AGCs significantly improved listeners' overall percent correct localization.

Conclusions:

  • Synchronizing AGCs helps mitigate FBRs caused by independent AGCs when head motion is permitted.
  • Synchronization restored performance to baseline levels, independent of AGC compression.
  • Synchronization did not address localization issues unrelated to AGC compression.