Which stage(s) of sleep is (are) shown in the figure?
a. Stage 1 sleep c. Stages 3 and 4 sleep
b. Stage 2 sleep d. Rem sleep
ANS: B
Stage 2 sleep is characterized by relatively low-voltage background electroencephalographic ac-tivity, sleep spindles and K-complexes, absence of eye movements, and tonic activity on an elec-tromyogram.
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