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Acoustically evoked potential: dependence upon age.

U Spink, H S Johannsen, W Pirsig

    Scandinavian Audiology
    |January 1, 1979
    PubMed
    Summary
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    Older adults exhibit faster P2-wave latencies in auditory evoked potentials, suggesting reduced efferent inhibition in their auditory pathways. This difference was observed at higher sound intensities.

    Area of Science:

    • Auditory Neuroscience
    • Neurophysiology
    • Gerontology

    Background:

    • Auditory evoked potentials (AEPs) reflect neural processing of sound.
    • Aging can affect auditory pathway function and neural processing.
    • Efferent auditory pathways play a role in modulating neural activity.

    Purpose of the Study:

    • To compare auditory evoked potentials (AEPs) between young and older adults.
    • To investigate age-related changes in the auditory pathway's neural processing.
    • To explore the role of efferent inhibition in auditory processing in aging.

    Main Methods:

    • Acoustically evoked potentials using pure tones (1 kHz) were recorded.
    • Two groups were studied: young adults (22 years) and older adults (average 63 years).

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  • Stimulus intensities ranged from 0 to 90 dB HL.

    • Main Results:

    • Older subjects showed significantly shorter P2-latencies at 60, 75, and 90 dB HL compared to younger subjects.
    • No significant age-related differences were found in N1/P2 amplitudes.
    • P1 and N1 latencies, and the intensity function exponent, did not differ significantly between groups.

    Conclusions:

    • Shorter P2-latencies in older adults may indicate decreased efferent inhibition in auditory nuclei.
    • Aging impacts specific aspects of auditory pathway processing, such as efferent control.
    • Further research is needed to fully understand age-related auditory processing changes.