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Related Concept Videos

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Interhemispheric Auditory Cortical Synchronization in Asymmetric Hearing Loss.

Jolie L Chang1, Ethan D Crawford1, Abhishek S Bhutada2

  • 1Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, California, USA.

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Summary

Auditory cortical activation in adults with asymmetric hearing loss (AHL) shifts from synchronous to asynchronous with poorer ear amplification. This change improves hearing in noise performance and restores normal temporal organization in auditory cortices.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neuroplasticity

Background:

  • Normal hearing (NH) exhibits asynchronous auditory cortical activation between hemispheres.
  • Adult-onset asymmetric hearing loss (AHL) leads to synchronous activation, progressing to single-sided deafness.

Purpose of the Study:

  • Map interhemispheric temporal reorganization from asynchrony to synchrony in AHL.
  • Evaluate the reversibility of interhemispheric synchrony and its impact on hearing in noise performance.

Main Methods:

  • Cross-sectional study of 49 subjects (AHL and NH) with varying interaural threshold differences.
  • Magnetoencephalography (MEG) measured M100 peak latency in auditory cortex.
  • Longitudinal study involved monaural amplification of the poorer ear in 3 AHL subjects over 12 months.

Main Results:

  • Interaural latency differences indicated asynchronous (NH), mixed (AHL 15-40 dB), and synchronous (AHL ≥ 45 dB) states.
  • Poorer ear amplification in longitudinal subjects shifted organization from synchrony to asynchrony.
  • Hearing in noise performance improved with poorer ear amplification.

Conclusions:

  • Interhemispheric temporal organization in AHL is intermediate between NH and single-sided deafness.
  • The mixed state of asynchrony and synchrony is reversible.
  • Poorer ear amplification restores normal auditory cortex temporal organization and improves hearing in noise.