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Auditory middle-latency responses in humans.

O Ozdamar, N Kraus

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1983
    PubMed
    Summary
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    This study compared auditory brain stem responses (ABR) and middle-latency responses (MLR) in humans. ABR is better for assessing hearing sensitivity, while MLRs may help diagnose central auditory processing disorders.

    Area of Science:

    • Neuroscience
    • Audiology
    • Electrophysiology

    Background:

    • Middle-latency responses (MLR) and auditory brain stem responses (ABR) are electrophysiological measures of auditory processing.
    • Simultaneous recording of MLR and ABR using wide bandpass filters allows for direct comparison of their characteristics.

    Purpose of the Study:

    • To compare MLRs and ABRs in humans.
    • To investigate the effects of sedation, stimulus properties, and scalp distribution on MLRs.
    • To determine the clinical utility of MLRs versus ABRs.

    Main Methods:

    • Unconventional recording technique with wide bandpass filters for simultaneous MLR and ABR recording.
    • Examination of effects of mild sedatives (chloral hydrate, diazepam).
    • Analysis of stimulus-related properties and coronal distribution of MLRs.

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    Main Results:

    • Mild sedatives did not significantly affect MLRs or ABRs.
    • MLRs and ABRs exhibited different stimulus-related properties, suggesting distinct underlying neural mechanisms.
    • The MLR component Pa showed maximal amplitude at the vertex and symmetrical temporal distribution.
    • ABR wave V and MLR components Na and Pa were reliably detected at moderate to high stimulus intensities.
    • ABR wave V detection was more robust than MLR components at low stimulus levels.

    Conclusions:

    • Auditory brain stem response (ABR) is the preferred method for assessing hearing sensitivity.
    • Middle-latency responses (MLRs) show potential clinical value for diagnosing neurological or central auditory processing disorders.