Harvard Group Scale of Hypnotic Susceptibility, Form A--French Version

Anlló, Hernán; Becchio, Jean; Sackur, Jérôme

doi:10.1037/t61923-000

Cited by 10 publications

(13 citation statements)

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“…This scale is a modified version of the WSGC (Bowers, 1993), it is adjusted to be ideal for screenings with larger groups of people and it contains items for each suggestion assessing the subjective experiences of the participants. Students, whose hypnotisability score is in the top fifteenth percentile based on their composite score (arithmetic mean of the subjective and objective scores), were recruited via email to attend the experiment (this threshold is comparable with those of employed by other researchers in the field; e.g., Anlló, Becchio, & Sackur, 2017;Barnier & McConkey, 2004). Based on the preregistration of the project (see details below), the stopping rule was to cease recruitment when the Bayes factor of the critical test (see details below) reached good enough sensitivity (either below 1/3 or above 3) or when had run 20 participants.…”

Section: Participantsmentioning

confidence: 99%

Does unconscious control depend on conflict?

Pálfi¹,

Seth²

2018

Preprint

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Unravelling the mechanisms that trigger cognitive control is a central question in cognitive science. Cognitive conflict is closely associated with the activation of cognitive control, helping individuals to follow their own goals. In this study, we examined whether the association of conflict and control holds when people are not aware of their intentions (i.e., they experience involuntariness regarding their behaviours). To induce unconscious control, we employed a posthypnotic suggestion (word blindness: that words will appear as a meaningless foreign script) on highly suggestible participants, a manipulation which has previously been shown to halve the Stroop interference effect. To alter the amount of conflict, we manipulated the proportion of incongruent, congruent and neutral Stroop trials between blocks in two experiments. The analyses revealed that the Stroop effect was reduced by the suggestion in the high conflict conditions (conditions with 33% or more incongruent trials), and barely at all in the low conflict conditions (conditions with 10% incongruent trials) compared to no suggestion conditions, thus, supporting the idea that a certain amount of conflict is required to activate unconscious control. This finding can also be interpreted in light of the two competing accounts of the word blindness effect (de-automatisation of reading and response competition models). The results imply that conflict between the response options occurs even in the suggestion condition and so the word blindness suggestion does not influence semantic processing as the de-automatisation of reading account postulates, rather, it is more likely that the suggestion facilitates the reduction of response competition.

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Section: Participantsmentioning

confidence: 99%

Does unconscious control depend on conflict?

Pálfi¹,

Seth²

2018

Preprint

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“…Twenty-one subjects (12 females, Mean Age = 24.5, SD = 4.2) scoring 9–11 ( M = 10, SD = 0.7) were recruited as high hypnotizable subjects from a larger sample screened with the French version of the Harvard Group Scale of Hypnotic Susceptibility, Form A ( Shor and Orne, 1962 ; Anlló et al, in press ). Each subject was paid 10€ for participation, the whole experiment lasting approximately 1 h. Subjects had normal or corrected-to-normal vision.…”

Section: Methodsmentioning

confidence: 99%

Perceiving Time Differences When You Should Not: Applying the El Greco Fallacy to Hypnotic Time Distortions

et al. 2016

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The way we experience and estimate time – subjective time – does not systematically correspond to objective time (the physical duration of an event). Many factors can influence subjective time and lead to mental dilation or compression of objective time. The emotional valence of stimuli or the levels of attention or expectancy are known to modulate subjective time even though objective time is constant. Hypnosis too is known to alter people’s perception of time. However, it is not known whether hypnotic time distortions are intrinsic perceptual effects, based for example on the changing rate of an internal clock, or rather the result of a response to demand characteristics. Here we distinguished the theories using the logic of the El Greco fallacy. When participants initially had to compare the duration of two successive events —with the same duration — while in “trance,” they responded that the second event was on average longer than the first event. As both events were estimated in “trance,” if hypnosis had impacted on an internal clock, they should have been affected to the same extent. Conversely, when only the first event was in “trance,” there was no difference in perceived duration. The findings conform to an El Greco fallacy effect and challenge theories of hypnotic time distortion arguing that “trance” itself changes subjective time.

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“…Across the general population, High and Low susceptibility individuals each represent around 12 to 17 percent of the population (see Shor & Orne, 1962;Anlló, Becchio & Sackur, 2017).…”

Section: Participantsmentioning

confidence: 99%

“…Two calls were launched in parallel, independently of each other, by different research assistants. One was the call for hypnotic susceptibility screening: participation was voluntary, in exchange of university credit, for a 2-hour session of the Harvard Group Scale of Hypnotic Susceptibility (Shor & Orne, 1962;Anlló, Becchio & Sackur, 2017). The other was the call for the present experiment: participants were contacted by e-mail and recruited in several rounds, contingently on whether they had previously participated in the concurrent hypnotic susceptibility screenings, but without knowing that the experiment itself would involve hypnosis.…”

Section: Participantsmentioning

confidence: 99%

Temporal dynamics of the hypnotic response

Anlló¹,

Hagège²,

Sackur³

2019

Preprint

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To establish the temporal dynamics of hypnotic responding, we composed an Attentional Blink paradigm in which both the first and second targets were faces, either expressing neutral or angry emotions. We then suppressed the emotional advantage of angry faces by means of a “hypnotic numbing” suggestion. Hypnosis attenuated only the emotional salience of the second target (T2), suggesting that hypnosis’ effects were time and resource dependent. Additionally, we found that hypnosis fostered changes in the attentional task-set of all participants, regardless of their hypnotizability. By implementing drift-diffusion decision modelling, we found that hypnosis lowered decision thresholds. These results portray hypnotic responding as a two-tiered process: first, hypnosis alters the attentional task-set, then, provided processing and response preparation are not interrupted, a hypnotic response based on this altered task-set is produced through late cognitive control strategies dependent on hypnotic susceptibility.

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Harvard Group Scale of Hypnotic Susceptibility, Form A--French Version

Cited by 10 publications

References 0 publications

Does unconscious control depend on conflict?

Does unconscious control depend on conflict?

Perceiving Time Differences When You Should Not: Applying the El Greco Fallacy to Hypnotic Time Distortions

Temporal dynamics of the hypnotic response

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