| 1. |
- Hiltunen, Seppo, et al.
(author)
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No evidence for theta power as a marker of hypnotic state in highly hypnotizable subjects
- 2021
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In: Heliyon. - : Elsevier. - 2405-8440. ; 7:4
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Journal article (peer-reviewed)abstract
- 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.
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| 2. |
- Hiltunen, Seppo, et al.
(author)
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The effects of hypnosis and hypnotic suggestions on the mismatch negativity in highly hypnotizable subjects
- 2019
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In: International journal of clinical and experimental hypnosis. - : Routledge. - 0020-7144 .- 1744-5183. ; 67:2, s. 192-216
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Journal article (peer-reviewed)abstract
- The neural mechanisms associated with hypnosis were investigated in a group of 9 high hypnotizable subjects by measuring the mismatch negativity (MMN) component of the auditory eventrelated potential (ERP). ERPs were recorded using a passive oddball paradigm to sinusoidal standard and deviant tone stimuli of 500 and 520 Hz, respectively, in four conditions: prehypnosis, neutral hypnosis, hypnotic suggestion for altering the tone perception, and posthypnotic conditions. Earlier studies have indicated that hypnosis and hypnotic suggestions might have an effect on MMN, but the results of our study contradict these results: No statistically significant differences were found between the conditions in the MMN amplitudes.
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