Sleep stage 3 is distinguished from sleep stage 4 by the:
a. Presence of bursts of theta waves
b. Presence of sleep spindles and k-complexes
c. Percentage of large delta waves present on the electroencephalogram
d. Percentage of relatively low-voltage, mixed-frequency waves
ANS: C
The distinction between stage 3 and stage 4 is usually found in the presence of large delta waves, or slow waves. At the beginning of stage 3, delta waves constitute 20% to 50% of the electroen-cephalogram. Stage 4 is identified by the presence of the delta waves for at least 50% of the electroencephalogram recording.
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