Correlation dimension changes of the EEG during the wakefulness-sleep cycle.
The mathematical tools of chaos theory make the quantification of a time series such as the electroencephalogram possible by calculating its correlation dimensions. In this study, the electroencephalogram was recorded from the vertex in cats during the wakefulness-sleep cycle and its correlation dimension was determined. For the estimation of the correlation dimension a new method, the point-correlation dimension was used. This method is more accurate than others currently used for tracking non-stationarities within the data. The point-correlation dimension was higher during the alert state than in slow wave sleep. It is suggested that during the alert state a different type of pacemaker activity takes over in the generation of the electroencephalogram.
Molnár
M
M
Institute for Psychology, Hungarian Academy of Sciences, Budapest.
Skinner
J E
JE
D000818:Animals; D002415:Cats; D004569:Electroencephalography; D005260:Female; D008297:Male; D008959:Models, Neurological; D012890:Sleep / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology*