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PubMed1996

Positive intrasurgical suggestion fails to affect postsurgical pain.

The present study explored the effect of positive intrasurgical suggestion during the anesthetic state on postsurgical pain. One-half of the patients who were undergoing elective cholecystectomy or hysterectomy received strong positive intrasurgical suggestion directed specifically towards reducing pain. The control patients received information about pain without suggestion content. There was no effect on postsurgical pain measured by the McGill Pain Questionnaire and a visual analogue scale. The lack of effect on postsurgical pain indicates that intrasurgical suggestion does not provide a therapeutic method to achieve pain control.

Adult↗

PubMed2006

Suggestion overrides the Stroop effect in highly hypnotizable individuals.

Cognitive scientists distinguish between automatic and controlled mental processes. Automatic processes are either innately involuntary or become automatized through extensive practice. For example, reading words is a purportedly automatic process for proficient readers and the Stroop effect is consequently considered the "gold standard" of automated performance. Although the question of whether it is possible to regain control over an automatic process is mostly unasked, we provide compelling data showing that posthypnotic suggestion reduced and even removed Stroop interference in highly hypnotizable individuals. Drawing on a large sample of highly hypnotizable participants, we examined the effects of suggestion on Stroop performance both with and without a posthypnotic suggestion to perceive the input stream as meaningless symbols. We show that suggestion administered to highly hypnotizable persons significantly reduced Stroop interference and derailed a seemingly automatic process.

Adult↗

PubMed2005

Children's suggestibility for an instance of a repeated event versus a unique event: the effect of degree of association between variable details.

Are children who experience an event repeatedly more suggestible about an instance of the event than children who experience it once? Researchers have answered this question both in the affirmative and in the negative. In this study, we hypothesized that the degree of association between details that changed across instantiations of the event would help to explain the discrepancy. Preschoolers (4- and 5-year-olds) and first graders (6- and 7-year-olds) participated in either a single play session or four repeated play sessions, each of which contained 16 critical details. Across play sessions in the repeat-event condition, half of the critical details were associated and half were not associated. During a biasing interview 2 weeks later, children were misinformed about half of the critical details. The next day, children answered free and cued recall questions about the target play session. Among older children, repeat-event participants were more suggestible than single-event participants, especially for high-association details. Among younger children, repeat-event participants were more suggestible than single-event participants for low-association details. Consistent with some current theories of children's memory, older children were more suggestible than younger children.

Age Factors↗

PubMed2005

Theory of mind, inhibitory control, and preschool-age children's suggestibility in different interviewing contexts.

The current study examined the relations among 3- to 5-year-olds' theory of mind, inhibitory control, and three measures of suggestibility: yielding to suggestive questions (yield), shifting answers in response to negative feedback (shift), and accuracy in response to misleading questions during a pressured interview about a live event. Theory of mind aided in the prediction of suggestibility about the live event, and inhibitory control was a moderator variable affecting the consistency of children's sensitivity to social pressure across situations. The findings indicate that theory of mind and inhibitory control predict children's suggestibility about a live event above and beyond yield, shift, and age and that the construct validity of shift may improve as children's inhibitory control develops.

Brain↗

PubMed2002

The role of attachment and cognitive inhibition in children's memory and suggestibility for a stressful event.

There has been increasing interest in children's abilities to report memories of and resist misleading suggestions about distressing events. Individual differences among children and their parents may provide important insight into principles that govern children's eyewitness memory and suggestibility for such experiences. In the present study, 51 children between the ages of 3 and 7 years were interviewed about an inoculation after a delay of approximately 2 weeks. Results indicated that parents' attachment Avoidance was associated with children's distress during the inoculation. Parental attachment Anxiety and the interaction between parental Avoidance and children's stress predicted children's memory for the inoculation. Cognitive inhibition was also a significant predictor of children's memory errors and suggestibility. Theoretical implications concerning effects of stress and individual differences on children's eyewitness memory and suggestibility are discussed.

Affect↗

PubMed1999

Suggestion audiometry for non-organic hearing loss (pseudohypoacusis) in children.

Pertaining to non-organic hearing loss in children, three goals should be attained: detection of this disease, determination of true hearing levels and information about the possible cause. Recently, objective tests have been used principally for children with non-organic hearing loss; however, these lack the simplicity and convenience of traditional audiometry. A new method, which is referred to as suggestion audiometry, since it is suggested to the patient that hearing will be improved as a result of the test procedure, was developed for the purpose of simultaneously achieving the above-stated three goals. The subjects were 20 patients aged 8-16 years suspected of demonstrating non-organic hearing loss and whose apparent hearing loss had been identified by school hearing examinations. Suggestion pure tone audiometry was useful for the detection of non-organic hearing loss and suggestion speech audiometry was valuable for the determination of true hearing levels. The subjects were classified into four groups according to the test results. We discuss causes of the disease based on the classification of the subjects obtained from this test procedure.

Adolescent↗

PubMed1999

The effects of repeated experience on children's suggestibility.

The effect of suggestive questions on 3- to 5-year-old and 6- to 8-year-old children's recall of the final occurrence of a repeated event was examined. The event included fixed (identical) items as well as variable items where a new instantiation represented the item in each occurrence of the series. Relative to reports of children who participated in a single occurrence, children's reports about fixed items of the repeated event were more accurate and less contaminated by false suggestions. For variable items, repeated experience led to a decline in memory of the specific occurrence; however, there was no increase in susceptibility to suggestions about details that had not occurred. Most errors after repeated experience were intrusions of details from nontarget occurrences. Although younger children and children who were interviewed a while after the event were more suggestible, respectively, than older children and those interviewed soon after the event, repeated experience attenuated these effects.

Child↗

PubMed1996

Reporting biases in hypnosis: suggestion or compliance?

The tendency of highly hypnotizable participants to bias their retrospective perceptual reports in response to instructional demands was reexamined with the addition of low-hypnotizable control participants instructed to simulate hypnosis. Mean scores of high-hypnotizable participants and simulators did not differ, but the responses of simulators to the demand instruction was less variable than those of high-hypnotizable participants, and the shape of the response distribution was different. Unlike simulators, some high-hypnotizable participants who had reported changes in perception that were consistent with a hypnotic suggestion subsequently reported changes opposite to those suggested by a demand instruction. These data were interpreted as suggesting that the responses of high-hypnotizable participants to both the demand instruction and the preceding hypnotic suggestion were not entirely due to compliance.

Adult↗

PubMed1988

Modifying hypnotic suggestibility with the Carleton Skills Training program.

The Carleton Skills Training (CST) program was used to investigate (a) whether increases in hypnotic responsiveness obtained at Carleton University could be replicated at a different laboratory, (b) the influence of demand characteristics on suggestibility gains, and (c) whether initial gains are maintained over time. After two screening sessions, a replication and experimental group received the CST program, while a control group was allowed to practice hypnotic responding. All groups were then tested twice. Whereas the replication group was told that training and testing were part of the same experiment, the experimental group was told that training and testing were unrelated. Trained subjects returned after 4 months for a final session. Results indicated that (a) the CST program does increase hypnotic responsiveness, (b) suggestibility gains found in this study were relatively modest, (c) demand characteristics may influence suggestibility gains, and (d) suggestibility gains were not maintained at follow-up.

Adolescent↗

PubMed1997

How effective is the motion-to-suppress safeguard? Judges' perceptions of the suggestiveness and fairness of biased lineup procedures.

The motion-to-suppress safeguard is designed to prevent false eyewitness identifications from leading to wrongful convictions. This safeguard is effective only if judges are sensitive to factors that influence lineup suggestiveness. The present study assessed judge sensitivity to foil, instruction, and presentation biases. Judges (N = 99) read a description of a hypothetical crime, perpetrator, and identification procedure followed by a motion to suppress the identification. Judges completed a questionnaire in which they ruled on the motion and rated the lineup's suggestiveness and fairness. Foil bias and instruction bias influenced judges' rulings and lineup evaluations as predicted. Hypotheses concerning presentation bias were not supported. These results suggest that judges are somewhat sensitive to lineup suggestiveness but there is room for improvement.

Adult↗

PubMed1998

More than suggestion: the effect of interviewing techniques from the McMartin Preschool case.

Child interviewing techniques derived from transcripts of the McMartin Preschool case were found to be substantially more effective than simple suggestive questions at inducing preschool children to make false allegations against a classroom visitor. Thirty-six children interviewed with McMartin techniques made 58% accusations, compared with 17% for 30 children interviewed with suggestive questions. Social influence and reinforcement appeared to be more powerful determinants of children's answers than simple suggestive questions. The SIRR model is proposed to explain how false statements may be elicited from children or adults. Categories identified in the SIRR model are suggestive questions, social influence, reinforcement, and removal from direct experience.

Child↗

PubMed1996

Determinants of suggestions for alcohol treatment.

Entry to treatment is often precipitated by suggestions or pressure from relatives or friends, but we know little of the circumstances in which suggestions to cut down on drinking include advice to seek professional help. In 1993, 1034 Ontario adults were asked in a random digit dialling telephone survey if they had said something to a friend or relative about their drinking, or suggested they cut down. About 35% had said something within the last year, and 15% had taken the further step of suggesting they seek professional help or helping them get assistance. Respondents were asked a series of questions about the circumstances of the most recent time they had said something to the person. Whether respondents who said something recommended seeking professional help is related to these circumstances, and to the respondent's demographics and relationship to the drinker.

Adolescent↗

PubMed2001

Patient-controlled analgesia and intra-operative suggestion.

In a double-blind randomised study, we investigated the influence of positive intra-operative suggestions, presented to anaesthetised patients undergoing total abdominal hysterectomy, on postoperative pain, nausea and vomiting. One hundred and forty patients were randomly allocated to listen to one of four tapes containing either white noise or positive suggestions. The positive suggestions related to pain, postoperative nausea and vomiting, or both. We found that the positive intra-operative suggestions had no beneficial effects in reducing postoperative pain or nausea scores, nor was the consumption of morphine or anti-emetics reduced.

Adult↗

PubMed1992

Taped therapeutic suggestions and taped music as adjuncts in the care of coronary-artery-bypass patients.

A randomized, single-blinded, placebo-controlled trial examined the benefits of taped therapeutic suggestions and taped music in coronary-artery-bypass patients. Sixty-six patients listened to either suggestion tapes or music tapes, intraoperatively and postoperatively; 29 patients listened to blank tapes intraoperatively and listened to no tapes postoperatively. Half the patients who listened to a tape found it helpful. There were no significant differences between groups in length of SICU or postoperative hospital stay, narcotic usage, nurse ratings of anxiety and progress, depression, activities of daily living, or cardiac symptoms. There were no significant differences in these same outcomes between the patients who were helped by the tapes and the patients not helped. These results suggest that if taped therapeutic suggestions have a measurable effect upon cardiac surgery patients, demonstrating this effect will require more detailed patient evaluations to identify subgroups of patients responsive to this type of intervention.

Aged↗

PubMed2001

Efficacy of induction and difficulty level in durability of post-hypnotic suggestions.

We examined whether participants instructed to reenter a hypnotic state as part of the post-hypnotic suggestion (PHS) show less decay in responding over an 8-week period than participants who do not receive such instructions. We also attempted to replicate Trussell, Kurtz, and Strube's (1996) finding on impact of difficulty level of suggestion on response curve. Fifty-nine highly susceptible participants were selected by the Stanford Hypnotic Susceptibility Scale: Form C (SHSS:C) and were assigned to one of four groups (two levels of Difficulty [easy-hard] x two levels of Condition [hypnotic PHS, non-hypnotic PHS]). Participants were tested for PHS at 1, 3, 6, and 8 weeks. A 2 x 2 x 4 (Difficulty x Condition x Time) factorial ANOVA was conducted, with Time as a repeated-measure. The outcome variable at each time was either pass or fail for relevant suggestion. None of the effects containing Condition as a term were significant indicating there is no advantage to using Berrigan, Kurtz, Stabile, and Strube's (1991) atypical induction technique to influence the durability of PHS. We found a significant Time effect but failed to replicate Trussell et al.'s findings for Difficulty level. The differing results found in these three recent studies (Berrigan et al., Trussell et al., and the current study) suggest the effects for durability of PHS may be quite fragile in spite of rigorous experimental controls used in all three studies.

Adult↗

PubMed2006

Suggestions of altered balance: Possible equivalence of imagery and perception.

Hypnotic suggestions describing an altered perception induce congruent changes in the subject's experience and behavior. However, it is not known whether an implicit suggestion, only indirectly referring to an altered perception, induces a behavioral response corresponding to that of the real situation. In this study, an implicit suggestion of backward falling (IMP) was given to high hypnotizable participants not exposed (W-Highs) and exposed (H-Highs) to a hypnotic induction and a group of low hypnotizable individuals (W-Lows). Their posture was evaluated through an elite system. The results after the IMP were compared with those after an explicit suggestion of backward falling (EXP). In both W-Highs and H-Highs, the IMP elicited the backward body sway expected in the corresponding real situation, whereas no response was found in W-Lows. The results are discussed in terms of a possible equivalence of imagery and perception or of a lack of the motor inhibition normally associated with motor imagery.

Adolescent↗

PubMed1993

The effects of direct versus indirect hypnotic suggestion on pain in a cold pressor task.

Past studies have investigated the usefulness of hypnosis in pain reduction. Although hypnotic analgesia has been found to be effective, it is generally only those subjects who are highly susceptible to hypnosis who benefit. Some experimenters have found that even low-susceptible subjects can use hypnotic analgesia, if the hypnotic induction uses indirect rather than direct hypnotic suggestions. In the present study, high- and low-susceptible subjects were tested for analgesia using either direct or indirect hypnotic suggestion on pain in a cold pressor task. Findings suggest that high susceptibles experience greater pain reduction than do low susceptibles. However, no significant differences were found between the pain reduction in the direct versus the indirect hypnotic suggestion groups. Possible explanations for this lack of differences are discussed.

Adult↗