Key result
High hypnotizable subjects exhibited sharply elevated coherence between distributed brain regions within theta and alpha frequency bands compared to low hypnotizable subjects.
Cross-Sectional (n=31)
High and low hypnotizable subjects exhibit distinct waking EEG spectral power and coherence patterns, suggesting differences in baseline mental activity.
Distinct EEG coherence patterns may mark hypnotizability traits; hypothesis-generating and should not yet change clinical practice.
EEG spectral power and coherence were analyzed under waking baseline condition in 19 high (HH) and 12 low (LH) hypnotizable subjects. In HH subjects, the theta1 and theta2 spectral power was higher than in LH. The major new finding of this study is that coherence between distributed brain regions was sharply elevated in HH subjects within the theta and alpha frequency bands. In contrast, spectral power and coherence of beta2 and gamma1 bands were higher in LH subjects as compared to HH subjects. However, the long distance coherence between frontal and posterior areas within beta-gamma frequency ranges was higher in HH subjects. It might be supposed that HH subjects are engaged in imaginal mental activity whereas LH ones are mainly engaged in linguistic activity. The neurophysiological basis of the obtained EEG differences is discussed.
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Kirenskaya et al. (2011) conducted a cross-sectional in Hypnotizability (n=31). High hypnotizability vs. Low hypnotizability was evaluated on EEG spectral power and coherence. High hypnotizable subjects exhibited sharply elevated coherence between distributed brain regions within theta and alpha frequency bands compared to low hypnotizable subjects.
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