Summary
Topographic aspects of all night sleep EEG were investigated in 10 healthy volunteers (age 20–35 years). EEG brain maps showed an increase of delta power from stage 1 to 4, a decrease of alpha power most pronounced parieto-occipitally and a slowing of the dominant alpha frequency. Differences of EEG power in different sleep stages (as compared to wakefulness) are displayed topographically. Analysis of the course of stage 2 showed an increase of delta power and a decrease of theta power in the first sections of the night, and an increase of beta power later in the night.
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Zeitlhofer, J., Anderer, P., Obergottsberger, S. et al. Topographic mapping of EEG during sleep. Brain Topogr 6, 123–129 (1993). https://doi.org/10.1007/BF01191077
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DOI: https://doi.org/10.1007/BF01191077