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Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Age-Related Changes in Interaural-Level-Difference-Based Across-Frequency Binaural Interference.

Matthew J Goupell1,2

  • 1Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, United States.

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|August 15, 2022
PubMed
Summary
This summary is machine-generated.

Older adults show impaired binaural hearing, with age-related hearing loss affecting sound localization more significantly. This study reveals age-related changes in processing across-frequency interaural level differences (ILDs).

Keywords:
across-frequency binaural interferenceagingbinaural hearinghearing lossinteraural level differences (ILDs)

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Gerontology

Background:

  • Sound localization in the horizontal plane relies on low-frequency interaural time differences and high-frequency interaural level differences (ILDs).
  • Older listeners often exhibit poorer horizontal-plane sound localization compared to younger listeners.
  • Age-related changes in across-frequency binaural processing remain poorly understood.

Purpose of the Study:

  • To investigate whether the frequency dependence of across-frequency interaural level difference (ILD) processing is altered in older adults.
  • To examine age-related changes in binaural performance and across-channel binaural interference.

Main Methods:

  • An across-frequency binaural interference task was employed to assess ILD processing.
  • Participants included 11 older (>65 yrs) and 20 younger (<30 yrs) listeners with normal hearing up to 2 kHz.
  • ILD discrimination thresholds and binaural interference were measured at 0.5, 1, 2, 4, and 8 kHz using a lateralization task.

Main Results:

  • Older listeners demonstrated ILD thresholds and binaural interference approximately twice as large as younger listeners.
  • Interferers at or below 1 kHz caused 2-3 times more across-frequency binaural interference in older adults.
  • Hearing thresholds were significant predictors of both single-tone ILD thresholds and binaural interference.

Conclusions:

  • Advancing age and associated high-frequency hearing loss (presbycusis) alter across-frequency ILD processing.
  • Older adults exhibit a reweighting of binaural information, potentially due to age-related temporal processing deficits.
  • Findings suggest neural plasticity may underlie observed age-related changes in spatial hearing abilities.