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Comodulation masking release for elderly listeners with relatively normal audiograms

R W Peters1, J W Hall

  • 1Department of Medical Allied Health Professions, University of North Carolina at Chapel Hill 27599-7190.

The Journal of the Acoustical Society of America
|November 1, 1994
PubMed
Summary
This summary is machine-generated.

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Elderly listeners showed higher hearing thresholds in noise, but both young and old listeners benefited from modulated noise. Comodulation masking release (CMR) was similar between groups, decreasing with higher modulation rates.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Gerontology

Background:

  • Hearing thresholds in noise are crucial for understanding speech and environmental sounds.
  • Aging can affect auditory processing, potentially impacting performance in noisy environments.
  • Comodulation masking release (CMR) quantifies the benefit of modulated noise over unmodulated noise for auditory detection.

Purpose of the Study:

  • To compare masked hearing thresholds and CMR in elderly and young normal-hearing listeners.
  • To investigate the effect of noise modulation rate on detection thresholds in both age groups.
  • To assess auditory filter shapes in elderly listeners to rule out confounding factors.

Main Methods:

  • Pure-tone detection thresholds were measured in narrow and wideband unmodulated and modulated noise (10-50 Hz) for elderly (62-83 years) and young listeners.

Related Experiment Videos

  • Comodulation masking release (CMR) was calculated from the masking data.
  • Auditory filter shapes were estimated for elderly listeners using standard psychoacoustic procedures.

    • Main Results:

    • Elderly listeners exhibited significantly higher masked detection thresholds than younger listeners in both unmodulated and modulated noise.
    • Both age groups showed lower thresholds in modulated noise compared to unmodulated noise.
    • Detection thresholds increased with increasing modulation rates for both narrow and wideband noise in both groups.
    • CMR was comparable between elderly and young listeners and decreased with higher modulation rates for both groups.
    • Auditory filters in elderly listeners were normal, excluding filter impairment as a cause for altered masking release.

    Conclusions:

    • Elderly individuals with normal hearing experience greater difficulty detecting tones in noise compared to younger individuals.
    • Modulated noise provides a masking release for both young and elderly listeners, though this benefit diminishes at higher modulation frequencies.
    • Age-related differences in auditory filter shape do not explain the observed masking patterns or CMR in this cohort.