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Stage 3 sleep is distinguished from stage 2 chiefly by the frequency and amplitude of its waves, being:
AHigh frequency, high amplitude
BLow frequency, low amplitude
CLow frequency, high amplitude
DHigh frequency, low amplitude
Answer & Solution
Correct answer: C. Low frequency, high amplitude
1. Sleep stages are told apart on the electroencephalogram.
2. Stage 2 is dominated by theta waves broken by spindles and K-complexes.
3. NREM stage 3 sleep is often referred to as deep sleep or slow-wave sleep.
4. It is characterized by low frequency, less than 3 Hz, high amplitude delta waves.
5. So stage 3 waves are slower and taller than those of stage 2.
_Source: OpenStax Psychology 2e (CC BY 4.0), Ch 4 'States of Consciousness', sections 4.1-4.6_
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