|
KMID : 0376619950200010001
|
|
Seoul Journal of Psychiatry
1995 Volume.20 No. 1 p.1 ~ p.8
|
|
|
Analysis of EEG Based on Chaos Theory in Schizophrenics
|
|
최성구
신철진/김승태/김용식
|
|
|
Abstract
|
|
|
Although there are many studies about the EEG analyses based on the chaos theory, little is published about the nonlinear dynamical characteristics of schizophrenic EEG. This study was conducted to elucidate the differentiation of the states
which
would
maximize the characteristics of schizophrenic EEG when it would be applied to analyze EEG data using the correlation dimension to measure the complexity of underlying brain dynamics.
Subjects were 5 male schizophrenic patients under medication and 6 normal male medical students. EEG data were obtained from frontal leads under the 4 different conditions(eye open without sound stimulation state, eye-closed without sound
stimulation
state, eye-closed with sound stimulation state, eye open with sound stimulation state) and digitized with analog-digital converter. Correlation dimensions were calculated using Grassberger-Procaccia algorithm from the digitized data.
Both groups showed higher values of correlation dimensions in eye-open state than eye-closed state. This trend was statistically significant in the patient group with sound stimulation state on F4 lead, and the normal control group without sound
stimulation state on F3 lead. Regardless of visual stimulation, the difference on correlation dimensions according to sound stimulation was not significant. Schizophrenic group revealed higher dimensional EEG than normal control group on F4 lead
in
eye-closed with sound stimulation state. The difference between eye open and eye-closed state was significantly smaller in patients than in normal controls on F4 lead when there was sound stimulation.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|