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NREM stage 3 is called deep or slow-wave sleep because it is characterised by:
AHigh amplitude delta waves
BLow amplitude beta waves
CBrief theta wave bursts
DRapid alpha wave runs
Answer & Solution
Correct answer: A. High amplitude delta waves
1. Each sleep stage is named for the waveform that dominates it.
2. NREM stage 3 sleep is often referred to as deep sleep or slow-wave sleep.
3. This stage is characterized by low frequency, less than 3 Hz, high amplitude delta waves.
4. Theta waves and spindles belong to the lighter stages instead.
_Source: OpenStax Psychology 2e (CC BY 4.0), Ch 4 'States of Consciousness', sections 4.1-4.6_
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