HIGHLIGHTS
SUMMARY
The second s tudy44 described a 50 s (~ 0.02 Hz) periodicity for both sleep spindles and slow waves, but analyses were restricted to carrier frequencies and amp;lt; ~ 0.12 Hz. Some s tudies48,49 described cyclic alternating patterns (CAPs) as periodic (~ 60-90 s, 0.011-0.017 Hz rhythms) bursts of both low- and high-frequency activity in NREM sleep, mostly based on visual analysis of the EEG signal. The authors found characteristic spectral peaks at ~ 0.05 Hz (20 s periodicity) for all frequency bands, ~ 0.25 Hz (4 s . . .
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