Portuguese Norms for the Waterloo-Stanford Group C (WSGC) Scale of Hypnotic Susceptibility

Carvalho, Cláudia Maria Constante Ferreira de; Kirsch, Irving; Mazzoni, Giuliana; Leal, Isabel

doi:10.1080/00207140802041850

Cited by 32 publications

(20 citation statements)

References 9 publications

(20 reference statements)

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“…That work found a significant difference in allele frequencies between highs and lows, but its power was limited by the necessarily small proportion of highs in the samples ( N = 19), which is due to the distribution of hypnotizability scores in the general population (Balthazard and Woody, 1989; De Pascalis et al, 2000; Carvalho et al, 2008). Our alternative approach of selective genotyping, in which individuals are sampled from the opposite tails of a quantitative trait, can substantially increase the power of population-based associations studies (Schork et al, 2000; Van Gestel et al, 2000).…”

Section: Discussionmentioning

confidence: 91%

Hypnotizability and Catechol-O-Methyltransferase (COMT) polymorphysms in Italians

Presciuttini

Gialluisi

Barbuti

et al. 2014

Front. Hum. Neurosci.

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Higher brain dopamine content depending on lower activity of Catechol-O-Methyltransferase (COMT) in subjects with high hypnotizability scores (highs) has been considered responsible for their attentional characteristics. However, the results of the previous genetic studies on association between hypnotizability and the COMT single nucleotide polymorphism (SNP) rs4680 (Val158Met) were inconsistent. Here, we used a selective genotyping approach to re-evaluate the association between hypnotizability and COMT in the context of a two-SNP haplotype analysis, considering not only the Val158Met polymorphism, but also the closely located rs4818 SNP. An Italian sample of 53 highs, 49 low hypnotizable subjects (lows), and 57 controls, were genotyped for a segment of 805 bp of the COMT gene, including Val158Met and the closely located rs4818 SNP. Our selective genotyping approach had 97.1% power to detect the previously reported strongest association at the significance level of 5%. We found no evidence of association at the SNP, haplotype, and diplotype levels. Thus, our results challenge the dopamine-based theory of hypnosis and indirectly support recent neuropsychological and neurophysiological findings reporting the lack of any association between hypnotizability and focused attention abilities.

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Section: Discussionmentioning

confidence: 91%

Hypnotizability and Catechol-O-Methyltransferase (COMT) polymorphysms in Italians

Presciuttini

Gialluisi

Barbuti

et al. 2014

Front. Hum. Neurosci.

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“…However, as Highs represent a small part of the general population (Balthazard and Woody 1989;De Pascalis et al 2000;Carvalho et al 2008), this preliminary report is useful to orient further investigation with a lower number of variables and a simpler experimental design. Moreover, at variance other cognitive/ emotional traits, i.e.…”

Section: Discussionmentioning

confidence: 95%

Is high hypnotizability a trouble in balance control?

et al. 2009

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Hypnotizability is a cognitive trait measured by standard scales and associated with peculiar physiological responses to cognitive and physical stimulations. Hypnotizability-related differences can also be observed in non-hypnotic state and in the absence of specific suggestions. In the normal bipedal stance subjects with high hypnotizability (Highs) exhibit a higher tolerance of alteration of the visual and leg/neck proprioceptive input with respect to low hypnotizable individuals (Lows). Aim of the study was to investigate whether this characteristic represents a disadvantage during highly demanding postural tasks. Sixteen Highs and 16 Lows of both genders participated in an experimental session consisting of maintaining balance while standing with open or closed eyes on a seesaw platform allowing roll movements. The results did not show significant differences between Highs and Lows in inclination area and time, with the exception of a greater ability of Highs with respect to Lows when they began the task displacing the body weight from the left to the right leg. Thus, high hypnotizability does not represent a disadvantage for balance control during highly demanding postural tasks. Together with previous studies, the present findings suggest that the Highs' postural control might shift from a very "economic", preeminently centrally driven functioning mode, characteristic of easy postural tasks, to an efficaciously periphery-controlled mode, required by difficult postural tasks.

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“…Finally, reduced inhibition of associative areas may contribute to the highs' perception of involuntariness in action, as suggested by the overactivity of the parietal cortex associated with the feeling that active movements are externally controlled in delusions of alien control [44,45]. In other words, the cognitive and sensorimotor correlates of hypnotizability may be two facets of the same cerebellar coin [14,37,46].…”

Section: Discussionmentioning

confidence: 99%

“…In fact, highs represent Electronic supplementary material The online version of this article (doi:10.1007/s12311-015-0671-y) contains supplementary material, which is available to authorized users. approximately 15 % of the population [13,14] and may also share some of their characteristics with the individuals with intermediate scores of hypnotic susceptibility.…”

Section: Introductionmentioning

confidence: 98%

Hypnotizability and Performance on a Prism Adaptation Test

et al. 2015

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The susceptibility to hypnosis, which can be measured by scales, is not merely a cognitive trait. In fact, it is associated with a number of physiological correlates in the ordinary state of consciousness and in the absence of suggestions. The hypnotizability-related differences observed in sensorimotor integration suggested a major role of the cerebellum in the peculiar performance of healthy subjects with high scores of hypnotic susceptibility (highs). In order to provide behavioral evidence of this hypothesis, we submitted 20 highs and 21 low hypnotizable participants (lows) to the classical cerebellar Prism Adaptation Test (PAT). We found that the highs' performance was significantly less accurate and more variable than the lows' one, even though the two groups shared the same characteristics of adaptation to prismatic lenses. Although further studies are required to interpret these findings, they could account for earlier reports of hypnotizability-related differences in postural control and blink rate, as they indicate that hypnotizability influences the cerebellar control of sensorimotor integration.

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Portuguese Norms for the Waterloo-Stanford Group C (WSGC) Scale of Hypnotic Susceptibility

Cited by 32 publications

References 9 publications

Hypnotizability and Catechol-O-Methyltransferase (COMT) polymorphysms in Italians

Hypnotizability and Catechol-O-Methyltransferase (COMT) polymorphysms in Italians

Is high hypnotizability a trouble in balance control?

Hypnotizability and Performance on a Prism Adaptation Test

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