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Temporal processing in the aging auditory system.

A Strouse1, D H Ashmead, R N Ohde

  • 1Division of Hearing and Speech Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA. anne.strouse@med.va.gov

The Journal of the Acoustical Society of America
|September 24, 1999
PubMed
Summary
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Elderly adults show deficits in auditory temporal processing and binaural sensitivity compared to younger adults, even with normal hearing. These age-related declines impact speech perception and are more pronounced at lower sound levels.

Area of Science:

  • Audiology
  • Neuroscience
  • Gerontology

Background:

  • Auditory processing declines with age, impacting communication.
  • Normal hearing does not preclude age-related auditory deficits.

Purpose of the Study:

  • To compare monaural temporal processing and binaural sensitivity in young and elderly adults with normal hearing.
  • To investigate the relationship between psychoacoustic measures and speech perception in different age groups.

Main Methods:

  • Gap detection thresholds for temporal processing and interaural time difference (ITD) thresholds for binaural processing were measured.
  • Speech perception was assessed using masking level difference (MLD) and voice onset time (VOT) tasks.
  • Tests were conducted at various sound levels above individual hearing thresholds.

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Main Results:

  • Elderly listeners exhibited poorer temporal and binaural processing across all tested sound levels.
  • Age-related differences in performance were more significant at lower stimulus levels.
  • Psychoacoustic measures did not correlate with speech perception measures in elderly adults.

Conclusions:

  • Age-related factors beyond peripheral hearing loss contribute to auditory processing deficits.
  • Temporal and binaural processing impairments in older adults may affect speech understanding.
  • The relationship between basic auditory processing and speech perception differs between young and elderly listeners.