title: Interhemispheric differences of the correlation dimension in a human sleep electroencephalogram.
abstract: The interhemispheric differences of the correlation dimension (D2) in the sleep electroencephalogram (EEG) of eight healthy right-handed students was investigated. During slow wave sleep (SWS) the D2 of the central EEG and the temporal left hemisphere (LH) EEG were significantly higher than those in the right hemisphere (RH) EEG; but during rapid eye movement (REM) sleep, the D2 of the central EEG and the occipital RH EEG were significantly higher. The D2 of EEG in the left temporal site during REM sleep were significantly higher than in the right during the first and third sleep cycles, but these were significantly lower during the fourth and fifth sleep cycles. During REM sleep, temporal brain activity may shift from the LH to the RH as morning approaches.
authors.affiliation: Center of Psychiatry and Neurology, Fukui Prefectural Hospital, Japan. toshio@po5.nsk.ne.jp
authors.forename: Toshio
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Shigeki
authors.initials: S
authors.lastname: Madokoro
authors.forename: Kiwamu
authors.initials: K
authors.lastname: Misaki
authors.forename: Jyunichi
authors.initials: J
authors.lastname: Murayama
authors.forename: Hiroki
authors.initials: H
authors.lastname: Nakagawa
authors.forename: Yuji
authors.initials: Y
authors.lastname: Wada
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D004569:Electroencephalography; D006801:Humans; D008297:Male; D012890:Sleep; D012894:Sleep Stages