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Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Hearing aid noise suppression and working memory function.

Tobias Neher1,2, Kirsten C Wagener3, Rosa-Linde Fischer4

  • 1a Medizinische Physik and Cluster of Excellence "Hearing4all" , Carl-von-Ossietzky University , Oldenburg , Germany.

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Summary

Hearing aid noise suppression can improve speech recall, but its effect on auditory working memory is inconsistent. This study found directional microphones aided speech recognition, regardless of user reading span.

Keywords:
Hearing aidscognitionindividual differencesnoise reductionworking memory

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Area of Science:

  • Audiology
  • Cognitive Science
  • Signal Processing

Background:

  • Research on hearing aid (HA) noise suppression and working memory is conflicting.
  • Auditory working memory is crucial for speech comprehension in noisy environments.

Purpose of the Study:

  • To investigate the impact of different HA noise suppression algorithms on auditory working memory.
  • To examine the relationship between working memory capacity (reading span) and HA performance.

Main Methods:

  • A computer simulation of bilateral HAs with four settings: unprocessed, directional microphones, single-channel noise reduction, and binaural coherence-based noise reduction.
  • Speech-weighted signal-to-noise ratio (SNR) improvement was matched across noise reduction settings.
  • Auditory working memory was assessed using listening span and N-back tasks at a +6 dB SNR in 20 experienced HA users (aged 55-80).

Main Results:

  • Directional microphones improved speech recognition and recall by ~6% compared to single-channel noise reduction in listening span tasks.
  • No significant effect of HA setting was observed in N-back tasks, which showed high test-retest variability.
  • No interaction was found between HA setting and individual reading span.

Conclusions:

  • Hearing aid noise suppression may enhance speech recognition and recall at positive SNRs, independent of user reading span.
  • Further research is needed to improve the reliability of auditory working memory assessments.