title: High-frequency components of the rat electrocorticogram are modulated by the vigilance states.
abstract: In view of the reports that in the human magnetoencephalogram, 40-Hz oscillations are more abundant in waking and REM sleep than in non-REM sleep, we performed a 24-h broad-band (0.25-64 Hz) spectral analysis of the electrocorticogram in unrestrained rats. Spectral power above 33 Hz was higher in waking and REM sleep than in non-REM sleep, and in the range of 6-38 Hz it was higher in REM sleep than in waking. Consistent frequency-specific changes in spectral power marked the transitions between vigilance states. The study demonstrates that the rat EEG exhibits state- and frequency-specific changes over a large frequency range.
authors.affiliation: Institute of Pharmacology, University of Zürich, Zürich-Irchel, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Franken
authors.forename: D J
authors.initials: DJ
authors.lastname: Dijk
authors.forename: I
authors.initials: I
authors.lastname: Tobler
authors.forename: A A
authors.initials: AA
authors.lastname: Borbély
mesh_terms: D000818:Animals; D001143:Arousal / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography; D004576:Electromyography; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012890:Sleep / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D014851:Wakefulness / Q000502:physiology