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Processing of temporal fine structure as a function of age.

John H Grose1, Sara K Mamo

  • 1Department of Otolaryngology - Head and Neck Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7070, USA. jhg@med.unc.edu

Ear and Hearing
|July 2, 2010
PubMed
Summary

Auditory temporal fine structure processing, measured by interaural phase difference (IPD) discrimination, declines with age even with normal hearing. Middle-aged and older adults show reduced IPD discrimination compared to younger adults, indicating early aging effects on auditory processing.

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Area of Science:

  • Auditory Neuroscience
  • Human Aging Research
  • Psychoacoustics

Background:

  • Auditory processing, particularly temporal fine structure (TFS) perception, is crucial for understanding speech, especially in noisy environments.
  • Age-related hearing loss often impacts high-frequency sounds, but subtle declines in auditory processing can occur even with normal audiograms.
  • Interaural phase difference (IPD) discrimination is a key measure for assessing TFS processing capabilities.

Purpose of the Study:

  • To investigate age-related changes in temporal fine structure (TFS) processing.
  • To determine if TFS processing, assessed via interaural phase difference (IPD) discrimination, declines with age despite normal audiometric hearing.
  • To compare IPD discrimination abilities across young, middle-aged, and older adult groups.

Main Methods:

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  • Two experiments were conducted to measure IPD discrimination.
  • Experiment 1 assessed discrimination of 0- and π-radian IPDs as a function of carrier frequency using a modulated tone stimulus.
  • Experiment 2 measured IPD discrimination at fixed frequencies using a tone pulse stimulus with varying IPDs. A total of 39 adults (15 young, 12 middle-aged, 12 older) with normal audiograms participated.

Main Results:

  • Younger adults demonstrated significantly better IPD discrimination than middle-aged and older adults across tested frequencies.
  • Middle-aged listeners showed reduced ability to discriminate IPDs compared to young adults, particularly at higher carrier frequencies.
  • Older listeners exhibited the poorest IPD discrimination thresholds overall, indicating a significant age-related decline in TFS processing.

Conclusions:

  • Deficits in temporal fine structure processing are present in the presenescent (middle-aged) auditory system.
  • These findings support the hypothesis that auditory temporal processing deficiencies emerge early in the aging process.
  • Early-onset temporal processing deficits may contribute to difficulties in understanding speech in challenging, noisy environments.