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Do hearing loss and cognitive function modulate benefit from different binaural noise-reduction settings?

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Area of Science:

  • Audiology
  • Cognitive Science
  • Signal Processing

Background:

  • Cognitive skills impact hearing aid algorithm benefits.
  • The role of hearing loss and cognitive function in noise reduction (NR) processing is not well understood.
  • Investigating these interactions is crucial for optimizing hearing aid technology.

Purpose of the Study:

  • To explore how hearing loss severity and cognitive function (working memory capacity) influence benefit from different binaural NR settings.
  • To assess these modulations using speech intelligibility, listening effort, and user preference measures.

Main Methods:

  • Forty elderly participants with mild to severe hearing loss were stratified by hearing loss degree and working memory (WM) capacity.
  • A binaural coherence-based NR algorithm with varying strengths (inactive to strong) was tested.
  • Speech recognition and listening effort (dual-task paradigm) were measured, alongside preference judgments, in simulated cafeteria noise.

Main Results:

  • Speech intelligibility and listening effort were unaffected by moderate NR but slightly impaired by strong NR across all groups.
  • All participants preferred some NR over no NR.
  • Individuals with lower WM capacity showed a preference for stronger NR compared to those with higher WM capacity.

Conclusions:

  • The tested NR algorithm's impact on speech recognition and listening effort is independent of hearing loss degree and WM capacity.
  • Preferred NR strength is linked to WM capacity, suggesting users with lower cognitive function may favor greater noise reduction.
  • Further research is needed to analyze SNR-dependent effects and generalizability.