Increased omega complexity and decreased microstate duration in nonmedicated schizophrenic patients.
To explore brain functions in schizophrenic patients, the global analytic strategy of multichannel EEG was performed that combines measures of global complexity (Omega), total power (Sigma) and generalized frequency (Phi), and EEG microstate analysis was applied to multichannel EEG data for 24 nonmedicated patients and 24 healthy subjects. The patients had higher Omega and Sigma values, and lower Phi values compared with healthy subjects. Three topographical classes were obtained from all EEG data by EEG microstate analysis. The mean duration of one topographical class in the patients was shortened compared to healthy subjects. These results indicated looser cooperativity, or decreased connectivity of the active brain process and deviant brain information processing in schizophrenic patients.
Irisawa
Satoshi
S
Department of Neuropsychiatry, Kansai Medical University, 10-15 Fumizono-cho, Moriguchi 570-8506, Japan. irisawas@takii.kmu.ac.jp
Isotani
Toshiaki
T
Yagyu
Takami
T
Morita
Sachi
S
Nishida
Keiichiro
K
Yamada
Keizo
K
Yoshimura
Masafumi
M
Okugawa
Gaku
G
Nobuhara
Kenji
K
Kinoshita
Toshihiko
T
D000293:Adolescent; D000328:Adult; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D012559:Schizophrenia / Q000503:physiopathology*; D012565:Schizophrenic Psychology; D013057:Spectrum Analysis