Structuring the inter-individual variation in waking EEG can help to discriminate between the objective markers of sleep debt and sleep pressure

Question of the study Our aim was to assess the inter-individual link between the principal component structure of the waking EEG and the response of the parameters of sleep-wake regulation to sleep loss. Subjects and methods Resting EEG was recorded 9 times at 3-h intervals with eyes closed and ope...

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Bibliographic Details
Published in:Somnologie : Schlafforschung und Schlafmedizin = Somnology : sleep research and sleep medicine 2009-06, Vol.13 (2), p.72-88
Main Authors: Putilov, A.A., Donskaya, O.G., Verevkin, E.G., Shtark, M.B.
Format: Article
Language:English
Subjects:
Cardiology
Electroencephalography
Internal Medicine
Medicine
Medicine & Public Health
Neurology
Open data
Originalien
Otorhinolaryngology
Pneumology/Respiratory System
Psychology
Ratings & rankings
Recording sessions
Sleep deprivation
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Summary:Question of the study Our aim was to assess the inter-individual link between the principal component structure of the waking EEG and the response of the parameters of sleep-wake regulation to sleep loss. Subjects and methods Resting EEG was recorded 9 times at 3-h intervals with eyes closed and open during the course of sustained wakefulness of 130 healthy subjects. The ipsatized power densities were calculated from the log-transformed absolute powers averaged across 10 frequency ranges (from slow delta to slow gamma). These spectra were further reduced by performing principal component analysis, which yielded the subjects’ scores on the largest principal components (PCs). Results and conclusions It was found that any EEG spectrum can be parsimoniously represented by only three scores on the PCs with eigenvalues greater or approximately equal to 1. These PCs remained virtually invariant in terms of the order of their extraction and loading patterns which signify EEG amplifying (1 st ), EEG slowing (2 nd ), and EEG smoothing (3 rd ). In the course of wakefulness, the 1 st PC score was related to sleep debt (i.e., self-reported sleep restriction on the morning preceding the experiment), while the 2 nd PC score was associated with sleep pressure (i.e., sleepiness perceived during night sleep deprivation).
ISSN:1432-9123
1439-054X
DOI:10.1007/s11818-009-0421-9