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Cochlear Tuning in Early Aging Estimated with Three Methods.

Courtney Coburn Glavin1,2, Sumitrajit Dhar1,3

  • 1Roxelyn and Richard Pepper Department of Communication Sciences & Disorders, Northwestern University, Evanston, IL, USA.

Trends in Hearing
|July 30, 2025
PubMed
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Early aging may subtly alter frequency selectivity, a key hearing function, even before traditional hearing loss is detected. This research highlights individual variability and differences in measurement methods for auditory tuning.

Area of Science:

  • Auditory Neuroscience
  • Gerontology
  • Otoacoustic Emissions

Background:

  • Age-related hearing loss (ARHL) affects millions, yet early changes in auditory function beyond basic detection remain poorly understood.
  • Frequency selectivity, or 'tuning,' is crucial for understanding speech and sound, but its early aging effects are unclear.

Purpose of the Study:

  • To investigate the impact of early aging on frequency selectivity using multiple measurement techniques.
  • To compare behavioral and physiological measures of auditory tuning in the same individuals.

Main Methods:

  • Employed fast psychophysical tuning curves (fPTC) for behavioral tuning assessment.
  • Utilized distortion product otoacoustic emission level ratio functions (DPOAE LRFs) and stimulus-frequency OAE (SFOAE) phase gradient delay for physiological tuning assessment.
Keywords:
age-related hearing lossbehavioral auditory tuningcochlear tuningfrequency selectivityotoacoustic emissions

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  • Compared tuning estimates from these three methods in individuals experiencing early aging.

    • Main Results:

    • Subtle changes in auditory tuning may occur during early aging, even with normal audiometric thresholds.
    • Significant differences were observed between psychophysical (behavioral) and otoacoustic emission (physiological) tuning estimates.
    • High individual variability in tuning estimates across all measures suggests unique influencing factors for behavioral tuning.

    Conclusions:

    • Age-related auditory decline can begin before 60 years, even without clinically defined hearing loss.
    • Characterizing ARHL beyond simple hearing thresholds is crucial for a comprehensive understanding.
    • Further research is needed to establish a gold standard for measuring human frequency selectivity and address individual variability.