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The post-auricular response. A single motor unit study.

D De Grandis, P Santoni

    Electroencephalography and Clinical Neurophysiology
    |December 1, 1980
    PubMed
    Summary
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    Acoustic stimuli synchronize motor unit (MU) firing in the retroauricular muscle, indicated by the post-auricular response (PAR). This synchronization, not direct nerve activation, suggests a novel auditory-motor pathway.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Motor Control

    Background:

    • The post-auricular response (PAR) is a physiological phenomenon observed in the retroauricular muscle.
    • Its functional significance and underlying neural mechanisms remain incompletely understood.

    Purpose of the Study:

    • To investigate the functional significance of the post-auricular response (PAR).
    • To elucidate the neural pathways involved in PAR generation.

    Main Methods:

    • Single motor unit (MU) potentials were recorded using microelectrodes inserted into the retroauricular muscle.
    • Acoustic stimuli (train of clicks) were used to elicit responses.
    • Analysis included latency measurements and averaging techniques with surface electrodes.

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    Main Results:

    • High variability in MU latency and delayed responses suggest indirect activation pathways.
    • Acoustic stimuli synchronized the firing of resting or activated MUs with latencies exceeding 70 msec.
    • The amplitude of the PAR correlated with the number of MUs synchronized.

    Conclusions:

    • The PAR is likely mediated by a synchronizing action of acoustic stimuli on MUs, rather than direct motoneuron activation.
    • This suggests a role for auditory input in modulating motor unit activity in the retroauricular muscle.
    • The findings provide insights into a potential auditory-motor interaction pathway.