Romanian norms for the Harvard Group Scale of Hypnotic Susceptibility,Form A

A Romanian-language version of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) was administered to 340 subjects (218 females and 122 males) recruited from 1998 to 1999 in Romania. Data were collected from three samples of participants to provide greater heterogeneity within the sample. The results from the Romanian version of the HGSHS:A were compared to those from Australian, Canadian, Danish, Finnish, German, Italian, Spanish, and original U.S. samples. The Romanian normative data are consistent with earlier normative studies in score distribution, item difficulty levels, and reliability. The mean score of the Romanian sample did not differ from those in the German and Italian samples but did significantly differ from the remaining samples. The total score reliability (.71) and item reliability of the Romanian sample was also comparable with published reference samples. No differences between women and men were found.     

Romanian Norms for the Harvard Group Scale of Hypnotic Susceptibility,Form A

A Romanian-language version of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) was administered to 340 subjects (218 females and 122 males) recruited from 1998 to 1999 in Romania. Data were collected from three samples of participants to provide greater heterogeneity within the sample. The results from the Romanian version of the HGSHS:A were compared to those from Australian, Canadian, Danish, Finnish, German, Italian, Spanish, and original U.S. samples. The Romanian normative data are consistent with earlier normative studies in score distribution, item difficulty levels, and reliability. The mean score of the Romanian sample did not differ from those in the German and Italian samples but did significantly differ from the remaining samples. The total score reliability (.71) and item reliability of the Romanian sample was also comparable with published reference samples. No differences between women and men were found.     

TAIWANESE NORMS FOR THE HARVARD GROUP SCALE OF HYPNOTIC SUSCEPTIBILITY,FORM A

Hypnotic susceptibility is a fundamental individual characteristic to consider in studies examining hypnosis. Although there is no existing normative data of group hypnotic susceptibility tests for the Mandarin-speaking Chinese population, the current study administered the Mandarin Chinese translation of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) to 242 subjects (137 females and 105 males). The results indicate that the normative properties—including the score distribution, item pass rates, and reliability—are comparable to 15 reference samples. In general, the Mandarin Chinese version of the HGSHS:A can be used as a viable and reliable instrument for prescreening subjects’ hypnotizability in the Mandarin Chinese-speaking population in Taiwan.     

Italian norms for the Harvard Group Scale of Hypnotic Susceptibility, Form A

Norms for an Italian translation of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) by Shor and Orne (1962) are presented. Subjects recruited from 1986 to 1989 were pooled, resulting in a sample of 376 participants (297 women and 79 men). The normative data were generally congruent with earlier normative studies in score distribution, item difficulty levels, and reliability. Women had significantly higher hypnotizability scores and item pass rates than men. The reliability scores of the Italian adaptation of the HGSHS:A were the same as a previously reported Danish sample and higher than a German sample, but lower than those of the Australian, Canadian, and original American samples. These results suggest that the Italian version of the HGSHS:A is an efficient tool for initial hypnotizability screening in an Italian context.     

Italian norms for the harvard group scale of hypnotic susceptibility,form a

Norms for an Italian translation of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) by Shor and Orne (1962) are presented. Subjects recruited from 1986 to 1989 were pooled, resulting in a sample of 376 participants (297 women and 79 men). The normative data were generally congruent with earlier normative studies in score distribution, item difficulty levels, and reliability. Women had significantly higher hypnotizability scores and item pass rates than men. The reliability scores of the Italian adaptation of the HGSHS:A were the same as a previously reported Danish sample and higher than a German sample, but lower than those of the Australian, Canadian, and original American samples. These results suggest that the Italian version of the HGSHS:A is an efficient tool for initial hypnotizability screening in an Italian context.     

Structural analysis of the harvard group scale of hypnotic susceptibility,form A

Multiple samples of Ss were tested on the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) of Shor and E. Orne, (1962) to examine the nature of the dimensions underlying the scale. Data were analyzed by the principal components method, the alpha factoring technique, and the Rasch model of analysis. The Basch model was used to specifically test the hypothesis that HGSHS:A measures just one dimension with items varying along a difficulty continuum. Results indicated that either a 2- or 3-factor solution is appropriate to HGSHS:A and that performance on the test cannot be explained in terms of a single dimension even when item difficulty is taken into account. Greatest instability of structure across both samples and methods of analyses was evident for the cognitive-delusory items on the scale. Implications for hypnotic theory and test construction are discussed.     

In Memoriam: Milton V. Kline 1923-2004

3 subgroups of 20 Ss with high, medium, or low scores on a slightly modified, tape-recorded version of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) of Shor and E. Orne (1962) were later administered the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C) of Weitzenhoffer and Hilgard (1962). HGSHSrA and SHSSrC correlated .59 which is lower than would be predicted by scale reliabilities. This, together with other data based on item characteristics, indicates that the 2 scales are not equivalent, but in part measure different aspects of hypnotic performance. Scores on HGSHSrA for low Ss are predictive of SHSS:C scores, but the stability of performance between HGSHS:A and SHSS:C is not as marked for medium and high Ss on HGSHS:A. This is partly a result of the failure of passive motor (primary) suggestibility to discriminate between levels of susceptibility, although challenge items do. The 2 clusters of items correlate .23 and .43 in HGSHS:A and SHSS:C respectively. The passive suggestibility items detract from the validity of the 2 scales.     

Norms of German Adolescents for the Harvard Group Scale of Hypnotic Susceptibility,Form A

The Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) has not been explicitly tested on an adolescent population. In this study, the German version of the HGSHS:A was administered to 99 German adolescents aged 15 to 19. In contrast to other studies, the gender distribution was relatively balanced: 57% female and 43% male. Results were comparable to 14 earlier studies with regard to distribution, mean, and standard deviation. Some peculiarities in contrast to the 14 previous studies are pointed out. It is concluded that the HGSHS:A can be used as a valid and reliable instrument to measure hypnotic suggestibility in adolescent samples.     

Portuguese norms for the Waterloo-Stanford Group C (WSGC) scale of hypnotic susceptibility

Portuguese norms for the Waterloo-Stanford Group C (WSGC) scale of hypnotic susceptibility are presented. A Portuguese translation of this scale was given to 625 Portuguese college students. Score distribution, item analysis, and reliability of the WSGC are presented and compared to three North American samples. The findings show that normative data from the Portuguese sample are congruent with the reference samples. The only significant difference obtained was a lower proportion of participants scoring within the high range of hypnotic suggestibility on the WSGC.     

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

Portuguese norms for the Waterloo-Stanford Group C (WSGC) scale of hypnotic susceptibility are presented. A Portuguese translation of this scale was given to 625 Portuguese college students. Score distribution, item analysis, and reliability of the WSGC are presented and compared to three North American samples. The findings show that normative data from the Portuguese sample are congruent with the reference samples. The only significant difference obtained was a lower proportion of participants scoring within the high range of hypnotic suggestibility on the WSGC.     

Four decades of group hypnosis scales: what does item-response theory tell us about what we've been measuring?

To overcome problems with previous psychometric approaches to hypnosis scales, the authors applied full-information factor analysis, based on multidimensional item-response theory (IRT), to a 39-year sample of 11,517 records of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A). They also performed a comparable analysis on the standardization sample of the Waterloo-Stanford Group C Scale (WSGC). The HGSHS:A emerges as two-factored, whereas the WSGC more closely approaches unidimensionality. The HGSHS:A factor structure and means show very little change over 4 decades. However, IRT-based item analysis on the HGSHS:A indicates that problems such as "pseudoguessing" on 2 items limit the quality of the item set. The authors propose alternative substantive interpretations of the traits that may underlie the two-factor structure.     

Hypnotic depth and hypnotic susceptibility: A replicated finding

A sample of 398 Ss was tested in groups of from 8 to 20 people on the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) of Shor and E. Orne (1962). Retrospective depth reports for each of the 12 HGSHS:A items were taken in order to extend Tart's findings (1970, 1972) on susceptibility and depth. The Ss were tested over 2 successive years in samples of N = 220 and N = 178. Since results were almost identical for each year (thus constituting a replication), the data were pooled for this report.

A remarkable consistency in patterns of subjective depth across the 12 items of HGSHS:A was found, particularly noticeable in Items 7, 8, 9, and 10 for 4 susceptibility groups (high, high-medium, low-medium and low-susceptible Ss) which appeared to reflect differential item difficulties. In addition, all correlations between reported depth and HGSHS:A total scores were high and statistically significant. While the findings are in general accord with those of Tart (1970, 1972), further research is required in order to determine the underlying basis of depth reports, and the degree to which experimental reports of susceptibility and clinical reports of depth reflect similar experiential aspects of hypnosis.     

Book review

To overcome problems with previous psychometric approaches to hypnosis scales, the authors applied full-information factor analysis, based on multidimensional item-response theory (IRT), to a 39-year sample of 11,517 records of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A). They also performed a comparable analysis on the standardization sample of the Waterloo-Stanford Group C Scale (WSGC). The HGSHS:A emerges as two-factored, whereas the WSGC more closely approaches unidimensionality. The HGSHS:A factor structure and means show very little change over 4 decades. However, IRT-based item analysis on the HGSHS:A indicates that problems such as “pseudoguessing” on 2 items limit the quality of the item set. The authors propose alternative substantive interpretations of the traits that may underlie the two-factor structure.     

Swedish Norms for the Harvard Group Scale of Hypnotic Susceptibility,Form A

This article examines the norms for a Swedish adaptation of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) (Shor & Orne, 1962). In total, 291 subjects (199 females and 92 males) participated in the study. Comparisons are made between the Swedish sample and reference samples,which include English versions of the HGSHS:A from the United States and Australia, as well as 5 translated versions from Italy, Finland, Denmark, Spain, and Germany. In the Swedish sample, females scored significantly higher than males. Generally, however, the normative data from the Swedish sample are congruent with the reference samples and therefore can be used as a tool for initial screening of hypnotic susceptibility in Sweden.     

Involuntariness of Response on the Harvard Group Scale of Hypnotic Susceptibility

Following a tape-recorded administration of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) of Shor and E. Orne (1962), some 272 Ss recorded their objective responses in the standard scoring booklet and then rated the voluntariness-involuntari-ness of their responses to each HGSHS:A item. The ratings indicated that in about 75% of the instances where HCSHS:A items were objectively passed, Ss experienced their response as completely or mostly involuntary, and this percentage did not differ between ideomotor items and the more difficult challenge items. For a subset of 35 Ss tested on the Stanford Hypnotic Susceptibility Scale, Form C (SHSS:C) of Weitz-enhoffer and Hilgard (1962), SHSS:C score was predicted reliably by HGSHS:A objective score. Thus, HGSHS:A is an adequate predictor of hypnotic susceptibility according to a criterion measure (SHSS:C), in spite of the fact that individual HGSHS:A items are not perfect measures of the classical suggestion effect according to the criterion of involuntar-iness. Ss with higher HCSHS:A scores had significantly higher mean involuntariness ratings for passed items than did lower scoring Ss.     

Direct and Indirect Scales of Hypnotic Susceptibility: Resistance to Therapy and Psychometric Comparability Abstract

Groups of participants were randomly assigned to receive either direct hypnotic procedure using the Harvard Group Scale of Hypnotic Susceptibility: Form A (HGSHS:A) or its indirect counterpart, the Alman-Wexler Indirect Hypnotic Susceptibility Scale (AWIHSS). Prior to hypnosis, participants completed the Inventory of Childhood Memories and Imaginings (a measure of fantasy proneness) and the Therapeutic Reactance Scale (TRS, a measure of resistance to therapeutic directives). The Phenomenology of Consciousness Inventory was completed in reference to a 2-minute sitting-quietly period embedded in the hypnotic procedure. Although results generally suggest that the two scales are alternate measures of hypnotizability, some differences were observed: (a) item difficulty levels differed on 4 of the 12 items; (b) subjects reported greater altered awareness with the direct method; and (c) contrary to the results of previous research, the more resistant subjects showed a tendency toward higher hypnotizability scores with the HGSHS:A, while the less resistant subjects responded better with the AWIHSS.     

Swedish norms for the Harvard Group Scale of Hypnotic Susceptibility, Form A

This article examines the norms for a Swedish adaptation of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) (Shor & Orne, 1962). In total, 291 subjects (199 females and 92 males) participated in the study. Comparisons are made between the Swedish sample and reference samples, which include English versions of the HGSHS:A from the United States and Australia, as well as 5 translated versions from Italy, Finland, Denmark, Spain, and Germany. In the Swedish sample, females scored significantly higher than males. Generally, however, the normative data from the Swedish sample are congruent with the reference samples and therefore can be used as a tool for initial screening of hypnotic susceptibility in Sweden.     

Direct and indirect scales of hypnotic susceptibility: resistance to therapy and psychometric comparability

Groups of participants were randomly assigned to receive either direct hypnotic procedure using the Harvard Group Scale of Hypnotic Susceptibility: Form A (HGSHS:A) or its indirect counterpart, the Alman-Wexler Indirect Hypnotic Susceptibility Scale (AWIHSS). Prior to hypnosis, participants completed the Inventory of Childhood Memories and Imaginings (a measure of fantasy proneness) and the Therapeutic Reactance Scale (TRS, a measure of resistance to therapeutic directives). The Phenomenology of Consciousness Inventory was completed in reference to a 2-minute sitting-quietly period embedded in the hypnotic procedure. Although results generally suggest that the two scales are alternate measures of hypnotizability, some differences were observed: (a) item difficulty levels differed on 4 of the 12 items; (b) subjects reported greater altered awareness with the direct method; and (c) contrary to the results of previous research, the more resistant subjects showed a tendency toward higher hypnotizability scores with the HGSHS:A, while the less resistant subjects responded better with the AWIHSS.     

Israeli norms for the Harvard Group Scale of Hypnotic Susceptibility, Form A

A Hebrew version of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) was administered to 283 subjects. Results were compared with those obtained for the English original administered in the United States, Canada, and Australia, as well as with versions translated into Swedish, Romanian, Italian, Finnish, Danish, Spanish, and German. Mean scores were similar to the Canadian and Australian, though lower than the others. No differences were found between males and females. Pass rates for individual items were similar or lower than elsewhere. Item reliability was similar to the other non-English versions. The author speculates that the slightly lower scores obtained may be due to the larger group of subjects present in each session. Overall, the Israeli data are congruent with the reference samples.     

Israeli Norms for the Harvard Group Scale of Hypnotic Susceptibility,Form A

A Hebrew version of the Harvard Group Scale of Hypnotic Susceptibility, Form A (HGSHS:A) was administered to 283 subjects. Results were compared with those obtained for the English original administered in the United States, Canada, and Australia, as well as with versions translated into Swedish, Romanian, Italian, Finnish, Danish, Spanish, and German. Mean scores were similar to the Canadian and Australian, though lower than the others. No differences were found between males and females. Pass rates for individual items were similar or lower than elsewhere. Item reliability was similar to the other non-English versions. The author speculates that the slightly lower scores obtained may be due to the larger group of subjects present in each session. Overall, the Israeli data are congruent with the reference samples.