Högskolan i Skövde

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  • 1.
    Hiltunen, Seppo
    et al.
    University of Helsinki, Finland.
    Virta, Maarit
    University of Helsinki, Finland.
    Kallio, Sakari
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. University of Turku, Finland.
    Paavilainen, Petri
    University of Helsinki, Finland.
    The effects of hypnosis and hypnotic suggestions on the mismatch negativity in highly hypnotizable subjects2019In: International journal of clinical and experimental hypnosis, ISSN 0020-7144, E-ISSN 1744-5183, Vol. 67, no 2, p. 192-216Article in journal (Refereed)
    Abstract [en]

    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.

  • 2.
    Kallio, Sakari
    et al.
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Systems Biology Research Centre. University of Turku, Finland.
    Koivisto, Mika
    University of Turku, Finland.
    Posthypnotic Suggestion Alters Conscious Color Perception in an Automatic Manner2013In: International journal of clinical and experimental hypnosis, ISSN 0020-7144, E-ISSN 1744-5183, Vol. 61, no 4, p. 371-387Article in journal (Refereed)
    Abstract [en]

    The authors studied whether a posthypnotic suggestion to see a brief, masked target as gray can change the color experience of a hypnotic virtuoso. The visibility of the target was manipulated by varying the delay between the target and the mask that followed it. The virtuoso's subjective reports indicated that her conscious color experience was altered already at short delays between the target and the subsequent mask. The virtuoso's objectively measured pattern of responding under posthypnotic suggestion could not be mimicked either by control participants nor the virtuoso herself. Due to posthypnotic amnesia, the virtuoso was unaware of suggestions given during hypnosis. Importantly, the virtuoso could not alter her color perception without a hypnotic suggestion. These results suggest that hypnosis can affect even a highly automatic process such as color perception.

  • 3.
    Kallio, Sakari
    et al.
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre.
    Koivisto, Mika
    University of Turku, Finland.
    Seeing Blue As Red: A Hypnotic Suggestion Can Alter Visual Awareness of Colors2016In: International journal of clinical and experimental hypnosis, ISSN 0020-7144, E-ISSN 1744-5183, Vol. 64, no 3, p. 261-284Article in journal (Refereed)
    Abstract [en]

    Some highly hypnotizable individuals have reported changes in objects' color with suggestions given in normal waking state. However, it is not clear whether this occurs only in their imagination. The authors show that, although subjects could imagine colors, a posthypnotic suggestion was necessary for seeing altered colors, even for a hypnotic virtuoso. She reported posthypnotic color alterations also selectively in response to specific target shapes in briefly presented object arrays. Surprisingly, another highly hypnotizable person showed a very different pattern of results. The control participants could not simulate virtuosos' results by applying cognitive strategies. The results imply that hypnosis can alter the functioning of automatic visual processes but only in some of the most hypnotizable individuals.

  • 4.
    Móró, Levente
    et al.
    University of Turku, Centre for Cognitive Neuroscience, Turku, FI-20014, Finland.
    Noreika, Valdas
    University of Turku, Centre for Cognitive Neuroscience, Turku, FI-20014, Finland.
    Revonsuo, Antti
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Systems Biology Research Centre.
    Sakari, Kallio
    University of Turku, Centre for Cognitive Neuroscience, Turku, FI-20014, Finland.
    Hypnotizability, sleepiness, and subjective experience2011In: International journal of clinical and experimental hypnosis, ISSN 0020-7144, E-ISSN 1744-5183, Vol. 59, no 2, p. 211-224Article in journal (Refereed)
    Abstract [en]

    The relationships between hypnotizability, sleepiness, and the subjective experience of hypnotic suggestions were investigated in 90 participants. Scores from the Harvard Group Scale of Hypnotic Susceptibility Form A (HGSHS:A), the Karolinska Sleepiness Scale (KSS), the Epworth Sleepiness Scale (ESS), the Pittsburgh Sleep Quality Index (PSQI), and our self-developed Questionnaire on Subjective Hypnotic Experiences (QSHE) were analyzed. Findings show that hypnotizability correlates with both habitual daytime sleepiness and instantaneous sleepiness after the hypnotic procedure. Results also indicate that subjective self-evaluation of responses to hypnotic suggestions may be a useful tool in some cases when comparing with other subjectively rated scales, such as those concerning sleepiness.

  • 5.
    Noreika, Valdas
    et al.
    University of Turku, Finland / Oxford University, United Kingdom.
    Falter, Christine M.
    University of Groningen, The Netherlands / Oxford University, United Kingdom.
    Arstila, Valtteri
    University of Turku, Finland.
    Wearden, John H.
    Keele University, United Kingdom.
    Kallio, Sakari
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Systems Biology Research Centre. University of Turku, Finland.
    Perception of Short Time Scale Intervals in a Hypnotic Virtuoso2012In: International journal of clinical and experimental hypnosis, ISSN 0020-7144, E-ISSN 1744-5183, Vol. 60, no 3, p. 318-337Article in journal (Refereed)
    Abstract [en]

    Previous studies showed that hypnotized individuals underestimate temporal intervals in the range of several seconds to tens of minutes. However, no previous work has investigated whether duration perception is equally disorderly when shorter time intervals are probed. In this study, duration perception of a hypnotic virtuoso was tested using repeated standard temporal generalization and duration estimation tasks. When compared to the baseline state, hypnosis affected perception of intervals spread around 600 ms in the temporal generalization task but did not alter perception of slightly longer intervals spread around 1000 ms. Furthermore, generalization of temporal intervals was more orderly under hypnosis than in the baseline state. In contrast, the hypnotic virtuoso showed a typical time underestimation effect when perception of longer supra-second intervals was tested in the duration estimation task, replicating results of the previous hypnosis studies.

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