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EEG source localization and global dimensional complexity in high- and low- hypnotizable subjects: a pilot study.
T Isotani1, D Lehmann, R D Pascual-Marqui
1The KEY Institute for Brain-Mind Research, University Hospital of Psychiatry, Zurich, Switzerland. isotani@takii.kmu.ac.jp
Neuropsychobiology
|November 10, 2001
Summary
High hypnotizability is linked to distinct brain electrical states, characterized by more posterior brain activity and higher dimensional complexity, indicating greater arousal before hypnosis. These findings differentiate high and low hypnotizable individuals.
Area of Science:
- Neuroscience
- Psychophysiology
Background:
- Individual differences in hypnotizability are well-established.
- Previous research on electroencephalography (EEG) characteristics related to hypnotizability has yielded controversial and incomplete findings, especially concerning source localization and EEG dimensionality.
Purpose of the Study:
- To investigate differences in resting-state EEG characteristics between high and low hypnotizable individuals.
- To explore intracerebral source localization and EEG dimensionality in relation to hypnotizability.
Main Methods:
- Analysis of 19-channel, eyes-closed resting EEGs from 8 high and 4 low hypnotizable healthy subjects.
- Utilized Fast Fourier Transform (FFT) Dipole Approximation and Low Resolution Electromagnetic Tomography (LORETA) for source localization across seven frequency bands.
- Assessed Global Field Power and Global Dimensional Complexity of EEG signals.
Main Results:
- Significant differences in the center of gravity for theta, beta-1, and beta-2 frequency bands were observed between high and low hypnotizable groups.
- LORETA indicated cortical anteriorization of beta-1 and beta-2 frequencies in low hypnotizable individuals.
- High hypnotizable subjects exhibited higher full-band Global Dimensional Complexity, suggesting greater arousal.
Conclusions:
- Individuals with high and low hypnotizability exhibit distinct pre-hypnotic brain electrical states.
- These differences include variations in the posterior-anterior distribution of brain activity and overall brain complexity.
- Higher dimensional complexity in high hypnotizable individuals may correlate with a higher state of arousal.