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Age-related changes in temporal resolution: envelope and intensity effects.

B Schneider1, F Speranza, M K Pichora-Fuller

  • 1University of Toronto. bschneid@credit.erin.utoronto.ca

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
|March 30, 1999
PubMed
Summary

Older adults exhibit poorer gap detection than younger adults, irrespective of hearing loss or sensation level. This age-related difference in auditory processing is not explained by temporal integration or spectral splatter.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Gerontology

Background:

  • Auditory temporal resolution, the ability to detect changes in sound over time, declines with age.
  • Gap detection is a key measure of auditory temporal resolution, assessing the ability to perceive brief silent intervals within a sound.

Purpose of the Study:

  • To investigate age-related differences in gap-detection thresholds.
  • To examine the influence of stimulus characteristics (Gaussian envelope standard deviation, sensation level) on age-related gap detection.
  • To test hypotheses regarding spectral splatter and temporal integration as explanations for age effects.

Main Methods:

  • Gap-detection thresholds were measured in 10 younger and 10 older adults.
  • Stimuli were tone pips with varying Gaussian amplitude envelope standard deviations (0.5-2 ms) presented at 40 and 60 dB SL.

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  • Data were analyzed to assess effects of age, sensation level, envelope SD, and hearing loss.

    • Main Results:

    • Older adults consistently showed larger gap-detection thresholds than younger adults across all conditions.
    • Gap-detection thresholds increased with the standard deviation of the Gaussian amplitude envelope for all participants.
    • Thresholds were largely independent of sensation level and degree of hearing loss.

    Conclusions:

    • Age-related deficits in auditory gap detection are robust and not explained by off-frequency spectral cues or prolonged temporal integration.
    • The findings suggest fundamental age-related changes in the neural processing of temporal auditory information.
    • Further research is needed to elucidate the precise neural mechanisms underlying age-related declines in temporal resolution.