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C3/A2 EEG 20-sec samples from a 21-year-old woman. These recordings were digitized at 200 Hz. Wake EEG is characterized by high frequency low amplitude waves. High-frequency, low-amplitude EEG is also present in REM sleep. NREM stage N2 EEG contains K-complexes and sleep spindles. Large, slow waves characterize NREM stage N3.
