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No evidence for theta power as a marker of hypnotic state in highly hypnotizable subjects
Teaching and Learning Services, University Services, University of Helsinki, Finland ; Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Finland.
Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Finland.
Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Finland.
Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Finland ; Cognitive Brain Research Unit, Department of Psychology and Logopedics, University of Helsinki, Finland.
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2021 (English)In: Heliyon, E-ISSN 2405-8440, Vol. 7, no 4, article id e06871Article in journal (Refereed) Published
Abstract [en]

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. 

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 7, no 4, article id e06871
Keywords [en]
Brain oscillations, EEG, Hypnosis, Hypnotic suggestion, Spectral-power density
National Category
Neurosciences
Research subject
Consciousness and Cognitive Neuroscience
Identifiers
URN: urn:nbn:se:his:diva-19700DOI: 10.1016/j.heliyon.2021.e06871ISI: 000646310700018PubMedID: 33997402Scopus ID: 2-s2.0-85104937684OAI: oai:DiVA.org:his-19700DiVA, id: diva2:1554792
Note

CC BY 4.0

© 2021 The Author(s)

This research did not receive any specific grant from funding agenciesin the public, commercial, or not-for-profit sectors.

Available from: 2021-05-17 Created: 2021-05-17 Last updated: 2021-09-08Bibliographically approved

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Kallio, Sakari

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