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Reflex inhibition audiometry. A new objective technique.

R R Marsh, H S Hoffman, C L Stitt

    Acta Oto-Laryngologica
    |May 1, 1978
    PubMed
    Summary
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    Auditory stimuli can inhibit reflexive eyeblinks, a finding suggesting potential for objective audiometry. This reflex inhibition is present even in infants as young as 6 weeks old.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Ophthalmology

    Background:

    • The reflexive eyeblink is a basic protective reflex.
    • Auditory stimuli can modulate other sensory reflexes.

    Purpose of the Study:

    • To investigate the inhibitory effect of auditory stimuli on tactile-elicited eyeblink reflexes.
    • To assess the potential application of this reflex inhibition in objective audiometry.
    • To examine the presence of this inhibitory process in infants and children.

    Main Methods:

    • Tactile stimulus used to elicit a reflexive eyeblink.
    • Auditory stimulus presented 100 msec before the tactile stimulus.
    • Threshold for reflex inhibition measured in adult subjects.
    • Preliminary investigation in infants and children.

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    Main Results:

    • Auditory stimulus preceding tactile stimulus by 100 msec significantly inhibits the reflexive eyeblink.
    • The threshold for this inhibitory effect is low in adults, indicating potential for audiometry.
    • The inhibitory process is observable, though variable, in infants from 6 weeks of age.

    Conclusions:

    • Reflex inhibition of the eyeblink by auditory stimuli is a viable phenomenon.
    • Objective audiometry may utilize this reflex inhibition.
    • The underlying neural mechanism is present from early infancy.