Which characteristics are associated with REM sleep?
1. Lower level tonic activity
2. High-voltage, low-frequency waves on an electroencephalogram
3. Absence of tonic activity on an electromyogram
4. Often absent responsiveness to external stimuli
a. 1 and 2 c. 1, 2, and 4
b. 3 and 4 d. 2, 3, and 4
ANS: B
Absence of tonic activity on an electromyogram and an often absent responsiveness to external stimuli are associated with REM sleep. Lower level tonic activity on an electromyogram and high-voltage, low-frequency waves on an electroencephalogram are indicative of non-REM sleep.
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