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Benjamin Wallace - One of the best experts on this subject based on the ideXlab platform.

  • Hypnotic Susceptibility, imaging ability, and anagram-solving activity.
    International Journal of Clinical and Experimental Hypnosis, 1996
    Co-Authors: Benjamin Wallace, Philip A. Allen, Ruth E. Propper
    Abstract:

    Abstract Anagram-solving activity was examined as a function of Hypnotic Susceptibility level and imaging ability In Experiment 1, anagrams that were composed of sets of letters that formed actual words (word anagrams), but when unscrambled formed other words, were compared to sets of letters that formed nonwords (nonsense anagrams). Word anagrams required more time to solve than nonsense anagrams. Also, fewer word anagrams were correctly solved compared to nonsense anagrams. Those individuals judged both high in Hypnotic Susceptibility and vivid in imaging ability demonstrated the best performance. In Experiment 2, anagrams that when unscrambled formed high-imagery words were compared to those that formed low-imagery words. High-imagery-word anagrams were solved more quickly and correctly than low-imagery-word anagrams. Such activity was best demonstrated by individuals who were judged to be both high in Hypnotic Susceptibility and vivid in imaging ability. These results are discussed in terms of strateg...

  • Fluctuations in Hypnotic Susceptibility and Imaging Ability Over A 16-Hour Period
    International Journal of Clinical and Experimental Hypnosis, 1995
    Co-Authors: Benjamin Wallace, Andrzej Kokoszka
    Abstract:

    Abstract Within-subject variability for Hypnotic Susceptibility as measured by the Harvard Group Scale of Hypnotic Susceptibility, Form A and for imaging ability as measured by the Vividness of Visual Imagery Questionnaire was determined over a 16-hour period. Half of the subjects were day persons, those most alert during daytime hours (as determined by the Alertness Questionnaire); the remaining subjects were night persons. For day persons, Hypnotic Susceptibility was greatest at 10:00 a.m. and 2:00 p.m.; for night persons, Susceptibility was greatest at 1:00 p.m. and between 6:00 p.m. and 9:00 p.m. Imaging ability also varied as a function of time of administration. However, these peak periods occurred before and after Hypnotic Susceptibility peaks. Such a pattern was interpreted as indicating the possible existence of an ultradian cycle for imaging ability.

  • Hypnotic Susceptibility imaging ability and the detection of embedded words within letters
    International Journal of Clinical and Experimental Hypnosis, 1994
    Co-Authors: Benjamin Wallace, Philip A. Allen, Timothy A Weber
    Abstract:

    Abstract Two experiments were conducted to determine the role of Hypnotic Susceptibility level (high or low) and imaging ability (vivid or poor) in the performance of a visual search for words embedded within matrices of letters. In Experiment 1, subjects searched for target words from a list; however, distractor words were also embedded in the matrices. Results indicated that subjects judged both high in Hypnotic Susceptibility and vivid in imaging ability demonstrated the fastest search speed with a greater percentage of target words found. These subjects also made fewer false alarm errors (locating distractor words not on the target list). The poorest performance was exhibited by subjects judged both low in Hypnotic Susceptibility and poor in imaging ability. The amount of variance accounted for by Hypnotic Susceptibility and imaging ability was approximately equal for each dependent measure. In Experiment 2, when subjects searched for target words from a list without distractor words embedded in matri...

  • day persons night persons and variability in Hypnotic Susceptibility
    Journal of Personality and Social Psychology, 1993
    Co-Authors: Benjamin Wallace
    Abstract:

    : Day persons (those most alert during daytime hours) and night persons participated in 2 experiments to examine within-subject variability of scores over time on the Harvard Group Scale of Hypnotic Susceptibility, Form A, and the Stanford Hypnotic Susceptibility Scale, Form C. Regardless of scale used, day persons exhibited peak Susceptibility at 10 a.m. and 2 p.m.; for night persons, peak Susceptibility was found at 1 p.m. and between 6 p.m. and 9 p.m. Furthermore, 2 peaks of temperature increase (1 p.m. and 6 p.m.) appeared to be associated with peaks in Hypnotic Susceptibility. However, such was shown to be associated with periods of food intake rather than with increases in Hypnotic Susceptibility. Results are examined with respect to methodological concerns and the potential existence of ultradian rhythms for Hypnotic responsiveness.

  • imagery vividness Hypnotic Susceptibility and the perception of fragmented stimuli
    Journal of Personality and Social Psychology, 1990
    Co-Authors: Benjamin Wallace
    Abstract:

    : Two experiments were conducted to determine the role of Hypnotic Susceptibility level (high or low) and imaging ability (vivid or poor) in the performance of gestalt closure tasks. In Experiment 1, subjects were required to identify fragmented stimuli in the Closure Speed Test and in the Street Test. In Experiment 2, subjects reported on fragmented stimuli that were projected to the right eye and subsequently produced an afterimage. Individuals were asked to identify the composite if possible and to report on the duration of the afterimage. In both experiments, Hypnotic Susceptibility level and imaging ability affected reports of gestalt closure. The greatest number of correct closures was reported by those who were both high in Hypnotic Susceptibility and vivid in imaging ability. In addition, in the second experiment, this group also reported the longest enduring afterimage. These results are discussed in terms of the processes required to perform in a gestalt closure task.

Pieter Sandijck - One of the best experts on this subject based on the ideXlab platform.

  • SHORT REPORTS Hypnotic Susceptibility in Patients With Conversion Disorder
    2020
    Co-Authors: Karin Roelofs, Kees Hoogduin, G P J Keijsers, Franny C Moene, Pieter Sandijck
    Abstract:

    Conversion disorder has been associated with Hypnotic Susceptibility for over a century and is currently still believed to be a form of autohypnosis. There is, however, little empirical evidence for the relation between Hypnotic Susceptibility and conversion symptoms. The authors compared 50 patients with conversion disorder with 50 matched control patients with an affective disorder on measures of Hypnotic Susceptibility, cognitive dissociation, and somatoform dissociation. Conversion patients were significantly more responsive to Hypnotic suggestions than control patients. In addition, conversion patients showed a significant correlation between Hypnotic Susceptibility and the number of conversion complaints. These results provide the first evidence of a relationship between Hypnotic Susceptibility and the presence and number of conversion symptoms.

  • Hypnotic Susceptibility in patients with conversion disorder
    Journal of Abnormal Psychology, 2002
    Co-Authors: Karin Roelofs, Kees Hoogduin, G P J Keijsers, Gerard Naring, Franny C Moene, Pieter Sandijck
    Abstract:

    : Conversion disorder has been associated with Hypnotic Susceptibility for over a century and is currently still believed to be a form of autohypnosis. There is, however, little empirical evidence for the relation between Hypnotic Susceptibility and conversion symptoms. The authors compared 50 patients with conversion disorder with 50 matched control patients with an affective disorder on measures of Hypnotic Susceptibility, cognitive dissociation, and somatoform dissociation. Conversion patients were significantly more responsive to Hypnotic suggestions than control patients. In addition, conversion patients showed a significant correlation between Hypnotic Susceptibility and the number of conversion complaints. These results provide the first evidence of a relationship between Hypnotic Susceptibility and the presence and number of conversion symptoms.

Helen J. Crawford - One of the best experts on this subject based on the ideXlab platform.

  • Individual differences in afterimage persistence: relationships to Hypnotic Susceptibility and visuospatial skills.
    American Journal of Psychology, 1992
    Co-Authors: Richard P Atkinson, Helen J. Crawford
    Abstract:

    : To investigate the moderating role of individual differences in Hypnotic Susceptibility and visuospatial skills on afterimage persistence, we presented a codable (cross) flash of light to 40 men and 46 women who had been dark adapted for 20 min. In an unrelated classroom setting, subjects had previously been given two standardized scales of Hypnotic Susceptibility (Harvard Group Scale of Hypnotic Susceptibility, Shor & Orne, 1962; Group Stanford Hypnotic Susceptibility Scale, Form C, Crawford & Allen, 1982) and the Mental Rotations Test (Vandenberg & Kuse, 1978). The first afterimage interval and the afterimage duration correlated significantly with Hypnotic responsiveness, supporting Wallace (1979), but did not show the anticipated relationships with mental rotation visuospatial skills. Individuals in the high hypnotizable group had (a) significantly longer afterimage intervals between its first appearance and first disappearance than did those in medium or low groups, as well as (b) significantly longer afterimages between the first appearance and the final disappearance than did those in low groups, but those in medium groups did not differ significantly from the other groups. Discriminant analysis using the afterimage persistence measures classified correctly 65.2% of high hypnotizables, 37.5% of medium hypnotizables, and 54.8% of low hypnotizables. Hypothesized cognitive skills that assist in the maintenance of afterimages and underlie Hypnotic Susceptibility include abilities to maintain focused attention and resist distractions over time and to maintain vivid visual images.

  • eeg correlates of Hypnotic Susceptibility and Hypnotic trance spectral analysis and coherence
    International Journal of Psychophysiology, 1990
    Co-Authors: Michel Sabourin, Helen J. Crawford, Steven D Cutcomb, Karl H Pribram
    Abstract:

    Abstract EEG was recorded monopolarly at frontal (F3, F4), central (C3, C4) and occipital (O1, O2) derivations during A-B-A conditions of waking rest, hypnosis (rest, arm immobilization, mosquito hallucination, Hypnotic dream), and waking rest. Stringently screened on several measures of Hypnotic Susceptibility, 12 very low hypnotizable and 12 very highly hypnotizable, right-handed under- graduate, subjects participated in one session. Evaluations were Fast-Fourier spectral analysis, EEG coherence between selected derivations and maximum spectral power within EEG bands. In eyes open and closed conditions in waking and hypnosis, highly hypnotizable subjects generated substantially more mean theta power than did low hypnotizable subjects at all occipital, central and frontal locations in almost all conditions of waking and hypnosis, with a larger difference in frontal locations. Both low and high hypnotizables showed increased mean theta power in hypnosis, suggesting an intensification of attentional processes and imagery enhancement. Mean alpha power was never a predictor of Hypnotic Susceptibility. Interactions with Hypnotic Susceptibility showed that highly susceptible subjects had more beta activity in the left than right hemispheres, while low susceptible subjects showed only weak asymmetry. No main effects for or interactions between waking/hypnosis and Hypnotic level were found for coherence between derivations or maximum spectral power within theta, alpha and beta EEG bands.

Katalin Varga - One of the best experts on this subject based on the ideXlab platform.

  • lack of correlation between Hypnotic Susceptibility and various components of attention
    Consciousness and Cognition, 2011
    Co-Authors: Katalin Varga, Zoltan Nemeth, Anna Szekely
    Abstract:

    Abstract The purpose of our study was to measure the relationship between performance on various attentional tasks and Hypnotic Susceptibility. Healthy volunteers (N = 116) participated in a study, where they had to perform several tasks measuring various attention components in a waking state: sustained attention, selective or focused attention, divided attention and executive attention in task switching. Hypnotic Susceptibility was measured in a separate setting by the Waterloo-Stanford Groups Scale of Hypnotic Susceptibility, Form C (WSGC). We found no significant correlation between any of the attentional measures and Hypnotic Susceptibility. Highly hypnotizables did not prove to be superior to or worse than the other individuals in any of the tests. These results do not support the neuropsychophysiological model of hypnosis, as they show no consistent relationship between Hypnotic Susceptibility and waking attentional performance.

  • phenomenological experiences associated with Hypnotic Susceptibility
    International Journal of Clinical and Experimental Hypnosis, 2001
    Co-Authors: Katalin Varga, Emese Jozsa, Eva I Banyai, Anna C Gosigreguss, V K Kumar
    Abstract:

    Abstract Following the administration of a Hungarian translation of the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C), 104 Hungarian subjects completed the Hungarian translation of the Phenomenology of Consciousness Inventory (PCI). Subjects had also been administered the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS: A) about 1 week to 2 months before the SHSS:C The pattern of correlations between hypnotizability (as measured by the HGSHS:A and the SHSS:C) and the 5 factors of the PCI was quite similar to that of previous work carried out using the English language versions on subjects in the United States. SHSS:C and HGSHS:A scores correlated significantly with the PCI factors of dissociated control, positive affect, and attention to internal processes factors. In addition, the SHSS:C score correlated significantly with the visual imagery factor, as found in previous work.

Kenneth S Bowers - One of the best experts on this subject based on the ideXlab platform.