Fractal analysis of EEG in hypnosis and its relationship with hypnotizability.
Fractal analysis was applied to study the trends of EEG signals in the hypnotic condition. The subjects were 19 psychiatric outpatients. Hypnotizability was measured with the Hypnotic Induction Profile (HIP). Fifty-four sets of EEG data were analyzed by detrended fluctuation analysis (DFA), a well-established fractal analysis technique. The scaling exponents, which are the results of fractal analysis, are reduced toward white noise during the hypnotic condition, which differentiates the hypnotic condition from the waking condition. Further, the decrease in the scaling exponents during hypnosis was solely associated with the eye-roll sign within specific cortical areas (F3, C4, and O1/2) closely related to eye movements and attention. In conclusion, the present study has found that the application of the fractal analysis technique can demonstrate the electrophysiological correlations with hypnotic influence on cerebral activity.
Lee
Jun-Seok
JS
Kwandong University College of Medicine, Myongji Hospital, Gyunggi, Korea. mdjslee@kwandong.ac.kr
Spiegel
David
D
Kim
Sae-Byul
SB
Lee
Jang-Han
JH
Kim
Sun-Il
SI
Yang
Byung-Hwan
BH
Choi
Joon-Ho
JH
Kho
Yong-Chul
YC
Nam
Jung-Hyun
JH
D000328:Adult; D001008:Anxiety Disorders / Q000503:physiopathology / Q000628:therapy*; D002540:Cerebral Cortex / Q000503:physiopathology*; D004213:Dissociative Disorders / Q000503:physiopathology / Q000628:therapy*; D004292:Dominance, Cerebral / Q000502:physiology; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D017709:Fractals; D006801:Humans; D006990:Hypnosis; D008297:Male; D008875:Middle Aged; D012063:Relaxation / Q000502:physiology; D012815:Signal Processing, Computer-Assisted; D013001:Somatoform Disorders / Q000503:physiopathology / Q000628:therapy*; D014851:Wakefulness / Q000502:physiology