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Central auditory function in a hearing-impaired white mouse.

K C Horner, C Barkway

    Hearing Research
    |January 1, 1986
    PubMed
    Summary
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    Central auditory pathways in viable dominant spotting mutant mice can activate despite inner ear dysfunction. This dysfunction may lead to seizures due to absent reflexes and auditory deprivation.

    Area of Science:

    • Neuroscience
    • Auditory system research
    • Genetics of hearing loss

    Background:

    • The stria vascularis is crucial for hearing, and its dysfunction causes hearing loss.
    • Viable dominant spotting mutant mice exhibit stria vascularis dysfunction and reduced endocochlear potential.
    • Despite hearing deficits, these mutants show a Preyer reflex to loud sounds.

    Purpose of the Study:

    • To investigate central auditory pathway responses in viable dominant spotting mutant mice.
    • To explore the link between strial dysfunction and central auditory processing.
    • To understand the mechanisms underlying audiogenic seizures in these mutants.

    Main Methods:

    • Utilized 14C autoradiography to measure metabolic activity in central auditory nuclei.

    Related Experiment Videos

  • Employed electromyography to record muscle reflexes, specifically the tensor tympani muscle.
  • Assessed susceptibility to audiogenic seizures.

    • Main Results:

    • Noise exposure increased metabolic rates in central auditory nuclei compared to silence.
    • The tensor tympani muscle reflex was absent in the mutant mice.
    • Mutant mice demonstrated a heightened susceptibility to audiogenic seizures.

    Conclusions:

    • The central auditory pathway in viable dominant spotting mutant mice is functional despite strial abnormalities.
    • The absence of the tensor tympani muscle reflex, coupled with auditory deprivation, may predispose these mice to audiogenic seizures.
    • This study highlights the complex interplay between peripheral auditory function and central processing in hearing disorders.