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Visual Representation of REM Sleep Brainwaves
A polysomnograph, as shown in Chart A, can be used to identify REM sleep by highlighting the period of rapid eye movements. Comparative charts of brainwave activity, like Chart B, further illustrate that the wave pattern during REM sleep is remarkably similar to the pattern observed when an individual is awake.

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A sleep study participant's brain wave recordings show high-frequency, low-amplitude waves, very similar to those of someone who is awake and alert. Simultaneously, monitoring of their muscle activity shows a near-complete lack of tone in their voluntary muscles. Which statement best analyzes this physiological state?