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Infant Auditory Processing and Event-related Brain Oscillations
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Aging affects neural precision of speech encoding.

Samira Anderson1, Alexandra Parbery-Clark, Travis White-Schwoch

  • 1Auditory Neuroscience Laboratory, Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 12, 2012
PubMed
Summary
This summary is machine-generated.

Older adults experience hearing difficulties due to reduced temporal precision in the auditory system. This age-related decline impacts speech understanding, especially in noisy environments.

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Area of Science:

  • Neuroscience
  • Auditory Processing
  • Gerontology

Background:

  • Older adults often struggle to understand speech, particularly in noisy settings.
  • This difficulty may stem from impaired processing of rapid speech elements due to aging.
  • Neural processing slows with age, affecting temporal precision in sensory systems.

Purpose of the Study:

  • To investigate if age-related loss of temporal precision causes subcortical timing delays.
  • To examine if this impacts auditory brainstem response (ABR) consistency and magnitude.
  • To correlate these neural changes with speech perception difficulties in older adults.

Main Methods:

  • Recorded auditory brainstem responses (ABRs) to the speech syllable /da/.
  • Compared ABRs in normal-hearing younger adults (18-30) and older adults (60-67).
  • Analyzed ABR timing, variability, phase locking, and response magnitude.

Main Results:

  • Older adults exhibited delayed ABRs, particularly during rapid formant transitions.
  • Older adults showed greater ABR variability and decreased phase locking.
  • Response magnitudes were smaller in older adults compared to younger adults.

Conclusions:

  • Results support the theory of reduced temporal precision in the aging auditory system.
  • Subcortical timing delays and decreased response consistency may underlie speech perception deficits.
  • Loss of temporal precision is a significant factor in age-related hearing difficulties.