Journal
NEUROSCIENCE LETTERS
Volume 340, Issue 1, Pages 17-20Publisher
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S0304-3940(03)00033-8
Keywords
spectral analysis; electroencephalogram localization; sleep deprivation
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Subjective sleepiness is part of the system controlling the decision to go to sleep in humans. Extended periods of waking lead to increased sleepiness, as well as to changes in cortical electroencephalogram (EEG) during waking. We investigated the association of sleepiness and awake EEG spectra during 40 h of wakefulness using multi-electrode EEG recordings for full coverage of the scalp. We found: (1) strong negative correlations of alpha (8-12 Hz) power with subjective sleepiness at all scalp locations, suggesting a negative association between sleepiness and general cortical activation; and (2) positive correlations of theta (4-8 Hz) power with subjective sleepiness with a focus on frontal locations, suggesting additional location specific associations between sleepiness and cortical activation. These findings support the notion that sleepiness is directly represented in the awake EEG. (C) 2003 Elsevier Science Ireland Ltd. All rights reserved.
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