Biomedical Engineering Reference
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FIGURE 4.12: (SEE COLOR INSERT)
Time frequency maps of EEG signal en-
ergy for 20-second epochs from different sleep stages shown above the correspond-
ing signals. a) Wakefulness, alpha waves marked by arrows; b) stage 2, two spindles
and K-complex marked; c) stage 3, two slow waves and a K-complex marked; d)
stage 4, slow waves marked. From [Malinowska et al., 2006].
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