Chin EMG activity during REM sleep is typically:

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Multiple Choice

Chin EMG activity during REM sleep is typically:

Explanation:
REM sleep brings almost complete loss of muscle tone, so chin EMG activity is typically absent or very low. This atonia is produced by brainstem mechanisms to prevent dream-actuated movements, though brief phasic twitches can occur without breaking the overall low tone. If chin EMG were high or moderate, that would suggest waking or a REM sleep with impaired atonia, rather than normal REM sleep.

REM sleep brings almost complete loss of muscle tone, so chin EMG activity is typically absent or very low. This atonia is produced by brainstem mechanisms to prevent dream-actuated movements, though brief phasic twitches can occur without breaking the overall low tone. If chin EMG were high or moderate, that would suggest waking or a REM sleep with impaired atonia, rather than normal REM sleep.

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