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Sleep electroencephalograms (EEG) were analyzed by non-linear analysis. Polysomnography (PSG) of nine healthy male subjects was analyzed and the correlation dimension (D2) was calculated. The D2 characterizes the dynamics of the sleep EEG, estimates the degrees of freedom, and describes the complexity of the signal. The mean D2 decreased from the awake stage to stages 1, 2, 3 and 4 increased during rapid eye movement (REM) sleep. The D2 during each REM sleep stage were high and those during each slow wave sleep stage were low, respectively, for each sleep cycle. The mean D2 of the sleep EEG in the second half of the night was significantly higher than those in the first half of the night. Significant changes were also observed during sleep stage 2, but were not seen during REM sleep and sleep stages 3 and 4. The D2 may be a useful method in the analysis of the entire sleep EEG.
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
August 2005,
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
January 1991,
Acta biochimica et biophysica Hungarica,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
July 1998,
Neuroscience letters,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
February 2004,
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
November 2004,
Medical engineering & physics,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
November 2011,
Neurological research,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
May 1998,
Electroencephalography and clinical neurophysiology,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
January 2003,
Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
January 1999,
Brain topography,
T Kobayashi, and
S Madokoro, and
Y Wada, and
K Misaki, and
H Nakagawa
October 1999,
International journal of psychophysiology : official journal of the International Organization of Psychophysiology,
