PET and fMRI scans have revealed that the brain's activity during REM sleep is:
A) very similar to its activity during both wakefulness and NREM slow-wave sleep.
B) at its lowest level of activity during the night's sleep.
C) distinctly different from its activity during either wakefulness or NREM slow-wave sleep.
D) greatly increased in both the frontal lobes and the primary visual cortex.
Correct Answer:
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