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Waking EEG spectral power and coherence differences between high and low hypnotizable subjects
Anna V Kirenskaya1, Vladimir Y Novototsky-Vlasov, Vyacheslav M Zvonikov
1Serbsky State Research Centre for Social and Forensic Psychiatry, Kropotkinsky by-street 23, Moscow, Russia. neuro11@yandex.ru
The International Journal of Clinical and Experimental Hypnosis
|August 27, 2011
Summary
High hypnotizable (HH) subjects show distinct EEG patterns, with higher theta and alpha band coherence in distributed brain regions. Low hypnotizable (LH) subjects exhibit higher beta and gamma band activity, suggesting different cognitive processing styles.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychophysiology
Background:
- Hypnotizability, a trait reflecting individual differences in hypnotic responsiveness, has been linked to distinct neurophysiological profiles.
- Understanding the brain mechanisms underlying hypnotizability can provide insights into consciousness and cognitive processes.
Purpose of the Study:
- To investigate the electroencephalography (EEG) spectral power and coherence differences between high (HH) and low (LH) hypnotizable subjects during a waking baseline condition.
- To explore the neurophysiological basis of varying hypnotizability levels.
Main Methods:
- Analysis of EEG spectral power and coherence in 19 HH and 12 LH subjects.
- Comparison of EEG activity across different frequency bands (theta, alpha, beta, gamma) between the two groups.
Main Results:
- HH subjects demonstrated significantly higher theta1 and theta2 spectral power compared to LH subjects.
- A major finding was sharply elevated coherence between distributed brain regions in HH subjects within the theta and alpha frequency bands.
- Conversely, LH subjects showed higher spectral power and coherence in beta2 and gamma1 bands, although HH subjects had greater long-distance coherence in beta-gamma ranges.
Conclusions:
- Distinct EEG patterns differentiate high and low hypnotizable individuals at baseline.
- Elevated theta and alpha coherence in HH subjects may reflect underlying differences in brain network engagement, potentially related to imaginal activity.
- Higher beta-gamma activity in LH subjects might be associated with linguistic processing, suggesting distinct neurophysiological correlates for different cognitive styles in hypnotizability.
