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Neurosci Lett. 1999 Aug 27;271(3):167-70.

Alpha EEG coherence in different brain states: an electrophysiological index of the arousal level in human subjects.

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1
Laboratorio de Sueño, Area de Psicofisiología Cognitiva, Seville, Spain. suesevilla@interbook.net

Abstract

The functional relationships between the brain areas supposedly involved in the generation of the alpha activity were quantified by means of INTRA- and INTER-hemispheric coherences during different arousal states (relaxed wakefulness, drowsiness at sleep onset, and rapid eye movement sleep) where such an activity can be clearly detectable in the human EEG. A significant decrease in the fronto-occipital as well as in the inter-frontal coherence values in the alpha range was observed with the falling of the vigilance level, which suggests that the brain mechanisms underlying these coherences are state dependent. Making fronto-frontal coherence values in the alpha frequency band useful indexes to discern between brain functional states characterized by a different arousal level.

PMID:
10507695
[Indexed for MEDLINE]
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