What is the distinguishing feature of the electroencephalogram during sleep stages 3 and 4?
a. Small beta waves c. Sleep spindles
b. Large k-complexes d. Large delta waves
ANS: D
The deepest stages of non-REM sleep (stages 3 and 4) are referred to as slow-wave sleep because of the presence of large delta waves that appear when the sleeper enters these stages.
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