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Impact of reduced spectral resolution on temporal-coherence-based source segregation.

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The Journal of the Acoustical Society of America
|December 10, 2024
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Summary

Hearing loss, including with cochlear implants (CIs), impairs speech understanding in noise. Reduced spectral resolution hinders the brain's ability to separate sound sources, impacting listening.", Enhanced_Abstract=default_api.SeocontentEnhancedAbstract(Area_of_Science=[

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Area of Science:

  • Auditory Neuroscience
  • Signal Processing in Hearing

Background:

  • Hearing-impaired individuals, including cochlear implant (CI) users, face significant challenges understanding speech in noisy environments.
  • Effective listening in noise relies on the brain's auditory source segregation, grouping sounds into distinct perceptual streams.
  • Temporal coherence across frequency channels aids normal-hearing listeners in sound segregation.

Purpose of the Study:

  • To investigate how reduced spectral resolution, common in sensorineural hearing loss and CI use, affects auditory source segregation.
  • To test the hypothesis that degraded spectral resolution impairs segregation based on temporal coherence.

Main Methods:

  • Development of a physiologically inspired computational model of temporal-coherence-based segregation.
  • Simulation of CI-induced current spread and outer-hair-cell damage within the model.
  • Comparison of model predictions with online behavioral data from simulated CI listening.

Main Results:

  • The computational model predicted that CI current spread reduces comodulation masking release (CMR), a measure of temporal coherence processing.
  • Model predictions aligned with behavioral data, showing reduced CMR and speech intelligibility in simulated CI listening.
  • The model also predicted decreased CMR with greater simulated outer-hair-cell damage.

Conclusions:

  • Reduced spectral resolution, a consequence of hearing loss and CI processing, impairs the brain's ability to segregate sound sources based on temporal coherence.
  • This impairment in segregation contributes to difficulties in understanding speech in noisy conditions for hearing-impaired listeners.
  • Findings highlight the critical role of spectral resolution in auditory perception and speech intelligibility.