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Envelope-based inter-aural time difference localization training to improve speech-in-noise perception in the

Maryam Delphi1, Yones Lotfi2, Abdollah Moossavi3

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Envelope-based interaural time difference (ITD) training significantly improved speech-in-noise perception and ITD thresholds in elderly individuals with normal hearing. This auditory training offers a promising solution for age-related hearing difficulties.

Keywords:
Interaural Time DifferenceLocalizationSpeech-in-Noise PerceptionTraining

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Area of Science:

  • Auditory Neuroscience
  • Gerontology
  • Speech Perception

Background:

  • Elderly individuals often experience speech-in-noise perception difficulties despite normal hearing thresholds.
  • Previous auditory training studies lacked etiological considerations, limiting generalizability.
  • Investigating targeted auditory training for specific auditory processing deficits is crucial.

Purpose of the Study:

  • To evaluate the efficacy of envelope-based interaural time difference (ITD ENV) localization training.
  • To assess improvements in ITD thresholds and speech-in-noise perception in elderly individuals.
  • To determine if ITD ENV training benefits those with normal hearing but impaired speech-in-noise understanding.

Main Methods:

  • Thirty-two elderly males (55-65 years) with normal hearing (250-2000 Hz) and speech-in-noise difficulties were recruited.
  • Participants were randomly assigned to an experimental group (9 sessions of ITD ENV training) or a control group.
  • Interaural time difference envelope thresholds and spatial word recognition scores in noise were measured pre- and post-training.

Main Results:

  • The experimental group showed significant improvements in ITD ENV thresholds (p≤0.001).
  • Spatial word recognition scores in noise also significantly improved in the trained group (p≤0.001).
  • Significant differences were observed between pre- and post-training measures within the experimental group.

Conclusions:

  • Envelope-based ITD localization training is effective for enhancing auditory localization abilities.
  • This training significantly improves speech-in-noise perception in older adults with normal hearing up to 2000 Hz.
  • ITD ENV training presents a viable intervention for age-related speech-in-noise processing deficits.