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Related Experiment Videos

Surface-recorded cochlear microphonic potentials during temporary threshold shifts in man.

H Pratt, H Sohmer, N Barazani

    Audiology : Official Organ of the International Society of Audiology
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Noise-induced temporary threshold shifts (TTS) in humans do not affect cochlear microphonic potentials (CM). This suggests the auditory nerve synapse, not hair cells, is the primary site affected by noise exposure.

    Area of Science:

    • Auditory Neuroscience
    • Otoacoustic Emissions
    • Hearing Science

    Background:

    • Temporary threshold shifts (TTS) are common auditory impairments.
    • Cochlear microphonic potentials (CM) reflect outer hair cell function.
    • Previous studies suggest noise affects auditory nerve function during TTS.

    Purpose of the Study:

    • To investigate the site of auditory system damage during noise-induced TTS in humans.
    • To differentiate the effects of noise on outer hair cells versus auditory nerve function.

    Main Methods:

    • Recording cochlear microphonic potentials (CM) using surface electrodes in human volunteers.
    • Inducing temporary threshold shifts (TTS) with white noise exposure.
    • Measuring behavioral hearing thresholds before, during, and after noise exposure.

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    Main Results:

    • Behavioral threshold shifts were observed after noise exposure.
    • No significant changes in the amplitude of cochlear microphonic potentials (CM) were detected during TTS.
    • These findings indicate CM generation site is unaffected by noise exposure causing TTS.

    Conclusions:

    • The site responsible for noise-induced TTS in humans is likely central to CM generation.
    • The auditory nerve synapse is proposed as the most probable site affected by noise exposure, peripheral to action potential generation.