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Altered peripheral and brainstem auditory function in aged rats.

G V Simpson, R T Knight, S Brailowsky

    Brain Research
    |November 25, 1985
    PubMed
    Summary
    This summary is machine-generated.

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    Aging rats show an 18 dB higher hearing threshold. This age-related hearing loss involves changes in the brainstem auditory pathways, not just the peripheral ear.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Gerontology

    Background:

    • Age-related hearing loss is a common sensory deficit.
    • Brainstem auditory evoked potentials (BAEPs) are crucial for assessing auditory pathway function.

    Purpose of the Study:

    • To investigate age-related changes in the auditory brainstem of rats using free-field BAEP audiometry.
    • To differentiate peripheral versus central auditory system contributions to hearing loss in aging rats.

    Main Methods:

    • Developed a technique for free-field BAEP audiometry in unanesthetized, unrestrained rats.
    • Recorded BAEPs in young and aged rats to clicks at equal intensity and at supra-threshold levels.

    Main Results:

    • Aged rats exhibited an 18 dB higher click threshold.

    Related Experiment Videos

  • Aged rats showed prolonged latencies for wave I, wave IV, and the prominent negative wave (No), alongside increased I-No and IV-No conduction times.
  • Central conduction time (I-IV) remained unchanged, but prolonged I-No and IV-No conduction times persisted even at supra-threshold levels in aged rats.

    • Conclusions:

    • Age-related hearing loss in rats involves alterations in the rostral auditory brainstem, beyond peripheral auditory system changes.
    • The prominent negative wave (No) latency delay suggests central auditory processing deficits associated with aging.