Gamma-band (30-40 Hz) connectivity during hypnosis in individuals with equal high hypnotizability but different dissociative experiences: a preliminary study
Hoda Taghilou, Mazaher Rezaei, Mohammad Ali Nazari, Alireza Valizadeh
Research Square November 1, 2022 preprint DOI: 10.21203/rs.3.rs-2107757/v1 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational study |
|---|---|
| Sample size | 20 |
| Population | People scoring 8 or higher on the Stanford Hypnotic Susceptibility Scale C |
| Measures | Stanford Hypnotic Susceptibility Scale C (SHSSC), Dissociative Experiences Scales (DES), 19-channel EEG gamma-band (30-40 Hz) connectivity |
| Key findings | Both highly hypnotizable groups showed reduced gamma-band (30-40 Hz) connectivity during hypnosis, but the pattern differed: the low-dissociative group showed reduced gamma connectivity in the interhemispheric medial frontal cortex, while the high-dissociative group showed reduced gamma connectivity in the left frontotemporal network. The authors interpret these as reductions in the default mode network and executive control network, respectively. |
Abstract
Abstract Background Most electrophysiological studies in hypnosis have divided individuals into two groups with high and low hypnotizability. However, this classification has been subjected to considerable criticism. The most important of these criticisms is that highly hypnotizable individuals can be divided into different groups due to their heterogeneity.
Methods: We selected 20 people with a score of eight or higher on the Stanford Hypnotic Susceptibility Scale C (SHSSC). We recorded the 19-channel EEG activity of the subjects in pre-hypnosis (baseline) and hypnosis conditions. We performed Dissociative Experiences Scales (DES) on them. We divided the subjects based on their DES score into two groups as high dissociative (HD) and low dissociative (LD). We predict that the two groups will have different gamma-band (30–40 Hz) connectivity despite equal hypnotizability.
Results: We found that both highly hypnotizable groups had reduced gamma connectivity during hypnosis. However, the characteristic gamma connectivity changes in the LD group decreased in the interhemispheric medial frontal cortex (MPFC). Furthermore, the HD group showed reduced gamma connectivity in the left frontotemporal network.
Conclusions: Indeed, the LD group showed reduced gamma in the "default mode network" and the HD group in the "executive control network".
Citations in the library
Cites 13
- The Brain's Default Mode Network Annual Review of Neuroscience May 4, 2015
- Mindfulness-induced changes in gamma band activity – Implications for the default mode network, self-reference and attention Clinical Neurophysiology September 21, 2011
- EEG default mode network in the human brain: Spectral regional field powers Neuroimage January 17, 2008
- Modulating the Default Mode Network Using Hypnosis International Journal of Clinical and Experimental Hypnosis March 24, 2012
- Hypnotic induction is followed by state-like changes in the organization of EEG functional connectivity in the theta and beta frequency bands in high-hypnotically susceptible individuals Frontiers in Human Neuroscience July 24, 2014
and 8 more in the library