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Area of Science:

  • Audiology
  • Cognitive Science
  • Signal Processing

Background:

  • Working memory influences speech recognition in challenging listening situations.
  • Previous studies often used omnidirectional settings, not reflecting real-world hearing aid use.
  • Directional processing in hearing aids may alter the impact of wide dynamic range compression (WDRC).

Purpose of the Study:

  • Investigate how hearing aid directionality and WDRC speed interact to affect speech recognition.
  • Examine the relationship between working memory, speech recognition, and signal modification.
  • Determine if directional processing mitigates WDRC-induced signal distortion.

Main Methods:

  • Twenty-three participants with hearing loss were tested with varying directionality (omnidirectional vs. directional) and WDRC speed (fast vs. slow).
  • Sentence recognition was measured across different signal-to-noise ratios (SNRs).
  • Signal modification was quantified using cepstral correlation.

Main Results:

  • Signal modification varied with SNR, directionality, and WDRC speed.
  • Speech recognition was associated with working memory, particularly at lower signal modification levels.
  • Directional processing reduced signal modification at higher SNRs, benefiting those with better working memory.

Conclusions:

  • Working memory remains a key predictor of speech recognition with hearing aids.
  • Directional processing can lessen the negative impact of fast-acting WDRC on speech cues.
  • Individuals with higher working memory capacity benefit more from reduced signal modification.