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Impedance changes elicited by electrocutaneous stimulation

G Djupesland, G Flottorp, A Sundby

    Audiology : Official Organ of the International Society of Audiology
    |July 1, 1977
    PubMed
    Summary
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    Electrical stimulation of the ear

    Area of Science:

    • Neuroscience
    • Audiology
    • Biomedical Engineering

    Background:

    • Electrical stimulation of the cavum conchae elicits bilateral acoustic impedance changes.
    • These changes are mediated by the stapedius muscle reflex.
    • Developing a safe and effective stimulator is crucial for research.

    Purpose of the Study:

    • To develop a hazard-proof stimulator for electrical skin stimulation.
    • To identify optimal stimulus parameters for eliciting large, reproducible stapedius muscle reflex.
    • To minimize subject discomfort during electrical ear stimulation.

    Main Methods:

    • Developed a constant-current square-wave pulse stimulator with a specialized surface electrode.
    • Investigated five stimulus parameters (pulse duration, frequency, interval, etc.).

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  • Assessed impedance changes and subject comfort to determine optimal settings.

    • Main Results:

    • An optimal stimulus was identified as a 0.5s pulse train at 200 Hz with 1ms pulse duration, delivered every 10s.
    • Habituation effects were observed, potentially masking parameter-specific responses.
    • The developed apparatus proved hazard-proof and independent of skin impedance.

    Conclusions:

    • A specific electrical stimulation protocol can reliably elicit stapedius muscle reflex-induced impedance changes.
    • The developed apparatus is suitable for audiological research and clinical applications.
    • Further research may explore habituation effects and refine stimulation parameters.