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Related Experiment Videos

Motoneuron properties during electromyogram pauses in sleep

L L Glenn, W C Dement

    Brain Research
    |July 8, 1982
    PubMed
    Summary

    Researchers studied brain activity preceding muscle pauses during sleep. They found that hyperpolarizing potentials in motoneurons correlate with these pauses, suggesting a shared neural mechanism across sleep stages.

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    Sleep medicine·2003

    Area of Science:

    • Neuroscience
    • Sleep Science
    • Electrophysiology

    Background:

    • Muscle atonia during REM sleep is crucial for preventing self-injury.
    • The precise electrophysiological mechanisms generating electromyogram (EMG) pauses during NREM and REM sleep remain incompletely understood.
    • Understanding these mechanisms may shed light on motor control and sleep disorders.

    Purpose of the Study:

    • To investigate the intracellular electrophysiological events preceding EMG pauses in hindlimb motoneurons during sleep.
    • To determine the origin and characteristics of these electrophysiological events.
    • To explore the relationship between these events and known sleep-related neural mechanisms.

    Main Methods:

    • Intracellular recordings from hindlimb motoneurons in vivo.
    • Measurement of membrane potential, conductance, and spike discharge.
    • Correlation of electrophysiological events with dorsal neck EMG and ponto-geniculo-occipital (PGO) waves.
    • Evoked EMG pauses via peripheral nerve stimulation.

    Main Results:

    • Phasic-event-related hyperpolarizing potentials (PRHPs) were identified in motoneurons, coinciding with EMG pauses and PGO waves.
    • PRHPs silenced spontaneously active motoneurons and reduced the firing rate of evoked spike trains.
    • Membrane conductance changes suggested PRHPs originate from presynaptic inhibition or dendritic mechanisms, not solely somatic inhibition.
    • PRHPs were most frequent during REM sleep.
    • EMG pauses could be evoked by peripheral nerve stimulation.

    Conclusions:

    • EMG pauses are generated by a cholinergic brainstem mechanism responsible for presynaptic inhibition of Ia afferents.
    • These findings support the hypothesis that startle responses are spontaneously elicited during both NREM and REM sleep.
    • The identified PRHPs represent a key electrophysiological correlate of muscle atonia during sleep.

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