A1 Refereed original research article in a scientific journal
No evidence for theta power as a marker of hypnotic state in highly hypnotizable subjects
Authors: Hiltunen Seppo, Karevaara Maria, Virta Maarit, Makkonen Tommi, Kallio Sakari, Paavilainen Petri
Publisher: ELSEVIER SCI LTD
Publication year: 2021
Journal: Heliyon
Journal name in source: HELIYON
Journal acronym: HELIYON
Article number: ARTN e06871
Volume: 7
Issue: 4
Number of pages: 10
ISSN: 2405-8440
eISSN: 2405-8440
DOI: https://doi.org/10.1016/j.heliyon.2021.e06871
Web address : https://doi.org/10.1016/j.heliyon.2021.e06871
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/58758166
EEG spectral-power density was analyzed in a group of nine highly hypnotizable subjects via ten frontal, central, parietal, and occipital electrodes under four conditions: 1) wake state, 2) neutral hypnosis, 3) hypnotic suggestion for altering perception of tones, and 4) post-hypnosis. Results indicate no theta-power changes between conditions, challenging previous findings that increased theta power is a marker of hypnosis. A decrease in gamma power under hypnotic suggestion and an almost significant decrease under neutral hypnosis were observed, compared to post-hypnosis. Anteroposterior power distribution remained stable over all conditions. The results are discussed and compared to earlier studies, which report heterogenous findings.
Keywords:
brain oscillations, EEG, Hypnotic suggestion, Spectral-power density
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