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Visual Representation of Brainwaves in Sleep Stages
An EEG-over-time graph can compare sleep-stage waveforms by showing wakefulness, Stage 1 NREM, Stage 2 NREM, Stage 3 NREM, and REM sleep on separate rows. In this example, awake activity has closely spaced waves with medium amplitude; Stage 1 NREM has relatively low-amplitude waves with periodic amplitude increases; Stage 2 NREM resembles Stage 1 but includes a K-complex around 10 to 12 seconds; Stage 3 NREM has a more uniform wave with gradually increasing amplitude; and REM resembles Stage 2 without the K-complex.
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Ch.4 States of Consciousness - Psychology @ OpenStax
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Non-Rapid Eye Movement (NREM) Sleep
Rapid Eye Movement (REM) Sleep
Hypnogram
Beta Waves
Comparison of REM and Non-REM Sleep
Brain Wave Frequency
Brain Wave Amplitude
Visual Representation of Brainwaves in Sleep Stages
A sleep researcher observes a participant's brain wave activity. At one point in the night, the readout shows low-frequency, high-amplitude waves. Later, the readout shows high-frequency, low-amplitude waves, similar to an awake state, accompanied by rapid eye movements. What is the most fundamental conclusion that can be drawn from these distinct patterns?
Visual Representation of Brainwaves in Sleep Stages