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Related Experiment Videos

The "eardrum artifact" in ipsilateral reflex measurements

H Kunov

    Scandinavian Audiology
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Acoustic impedance measurements can contain errors due to the ear canal's non-linearity. This study explains an artifact synchronous with stimuli, which grows with stimulus intensity, and offers a method to measure it.

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    Area of Science:

    • Audiology
    • Acoustics
    • Biomedical Engineering

    Background:

    • Ipsilateral reflex measurements using impedance audiometry are crucial for assessing middle ear function.
    • Non-linear acoustic properties of the ear canal and tympanic membrane can introduce measurement errors.
    • Understanding these errors is vital for accurate diagnostic interpretation.

    Purpose of the Study:

    • To identify and explain a source of error in ipsilateral reflex measurements using impedance methods.
    • To characterize the behavior of this measurement artifact.
    • To propose a practical method for quantifying the artifact's magnitude.

    Main Methods:

    • Analysis of the acoustic impedance of the ear canal and tympanic membrane as a non-linear system.
    • Investigating the relationship between stimulus intensity and artifact magnitude.

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  • Examining the effect of stimulus frequency on the artifact.
  • Developing and describing a practical measurement technique for the artifact.

    • Main Results:

    • A measurement artifact, synchronous with the applied stimulus, arises from the non-linearity of the ear canal and tympanic membrane.
    • The artifact's magnitude increases proportionally with stimulus intensity.
    • The artifact's magnitude shows minimal sensitivity to changes in stimulus frequency.

    Conclusions:

    • The inherent non-linearity of the ear canal and tympanic membrane is a significant source of error in acoustic impedance measurements.
    • This artifact can affect the accuracy of ipsilateral reflex measurements.
    • A practical method for measuring this artifact is presented, aiding in more precise audiological assessments.