During which sleep stage do sleep spindles first occur?
A) Stage 1
B) Stage 2
C) Stage 3
D) Stage 4
Answer: B
Rationale: Stage 2 is the first sleep stage to include sleep spindles--periodic bursts of EEG activity. What these large spikes in brain activity mean is not completely understood, but evidence suggests they may play a role in the process of memory storage.
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a. 16; 2.7 b. 25; 15 c. 46; 14 d. 85; 10
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