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Respiratory airway changes in response to suggestion in normal individuals.

Thirty normal individuals were told they were inhaling a substance that would either cause breathing difficulty (N = 15) or not affect breathing (N = 15). Total respiratory resistance was measured prior to and during inhalation. In reality, the subjects inhaled no substance; inhalation consisted of breathing normally into a respiratory resistance recorder. Individuals who received the former suggestion exhibited increased total respiratory resistance during inhalation, whereas individuals who received the latter suggestion did not. These observations demonstrated that the ability of suggestion to affect the respiratory airway is not limited to asthmatic individuals.

Adolescent↗

Implicit processing and therapeutic suggestion during balanced anaesthesia.

The effect of therapeutic suggestion--implicit processing during balanced anaesthesia was studied in 70 female patients scheduled for elective breast surgery. The patients were randomly allocated to listen to a message with reassuring information focused on minimising postoperative nausea and vomiting, or just a blank tape during surgery. Occurrence of nausea and vomiting was studied during the postoperative period. No patient recalled any explicit memories during the peroperative period. No major differences were observed in the number of patients who experienced nausea or vomiting during the 24 hour observation period. The patients exposed to positive suggestion did, however, have a lower frequency of recall for nausea and vomiting compared to those just listening to the blank tape. We did not observe any major effect of peroperative suggestion for postoperative nausea and vomiting. However, we cannot rule out some implicit processing during balanced anaesthesia.

Adult↗

Provocation of nonepileptic seizures by suggestion in a general seizure population.

Nonepileptic seizures (NES) are common and are often diagnosed at epilepsy centers by video-EEG recording of both spontaneous and suggestion-induced episodes, but no study has evaluated provocative testing in a general seizure population. We studied consecutive patients with a tentative diagnosis of epilepsy using saline provocation during video-EEG recording, suggesting that this could produce a typical seizure. Of 52 patients, 40% had no response, 23% had responses unlike their seizures, and 37% had typical episodes (positive test). Patients whose usual episodes resembled complex partial seizures (CPS) were more likely to have NES than were patients with a history of generalized tonic-clonic seizures (GTC). Of patients with positive provocations, the primary physician predicted NES in 68% of cases. This preliminary study suggests that NES are frequent in a general neurology setting, and that saline provocation is a sensitive method of identifying NES.

Adult↗

The relationship of intelligence and memory to interrogative suggestibility: the importance of range effects.

This paper looks at the relationship between intelligence, memory and interrogative suggestibility, particularly with reference to range effects. The subjects were 60 normal subjects and 100 forensic patients who had completed the Gudjonsson Suggestibility Scale (GSS) and the Wechsler Adult Intelligence Scale. Clear range effects of IQ and memory were evident in their relationship with suggestibility.

Adult↗

Psychophysiological responses to subliminal auditory suggestions for activation.

The aim of this study was to characterize further the experimental procedure proposed by Borgeat and Goulet in 1983. Subliminal activation auditory suggestions were expected to increase heart rate and skin conductance in presence of a stressing task. 20 subjects were alternately exposed to activating or neutral (random numbers) 25-dB suggestions masked by a 40-dB white noise. Analyses of variance and covariance indicated an effect of the activating suggestions on heart rate but not on skin conductance. Partly confirming previous results, the data support the reliability of heart rate and the importance of a stressing factor to reveal the effects of preconscious or subliminal stimulations.

Adult↗

Suggestion, hypnosis and hypnotherapy: a survey of use, knowledge and attitudes of anaesthetists.

Clinical hypnosis is a skill of using words and gestures (frequently called suggestions) in particular ways to achieve specific outcomes. It is being increasingly recognised as a useful intervention for managing a range of symptoms, especially pain and anxiety. We surveyed all 317 South Australian Fellows and trainees registered with ANZCA to determine their use, knowledge of, and attitudes towards positive suggestion, hypnosis and hypnotherapy in their anaesthesia practice. The response rate was 218 anaesthetists (69%). The majority of respondents (63%) rated their level of knowledge on this topic as below average. Forty-eight per cent of respondents indicated that there was a role for hypnotherapy in clinical anaesthesia, particularly in areas seen as traditional targets for the modality, i.e. pain and anxiety states. Nearly half of the anaesthetists supported the use of hypnotherapy and positive suggestions within clinical anaesthesia. Those respondents who had experience of clinical hypnotherapy were more likely to support hypnosis teaching at undergraduate or postgraduate level when compared with those with no experience.

Adult↗

Predictors of suggestibility and false-memory production in young adult women.

Recent controversy over memories retrieved in therapy has highlighted the importance of increasing our understanding of individual differences in suggestibility and false-memory production. The purpose of this laboratory study was to assess the ability of several clinically relevant variables (acquiescence, self-esteem, and negative affect) to predict the tendency to yield to suggestive questioning, to alter responses in the face of interpersonal criticism, or to produce false memories (in this study, false recall of implied words). Results indicated that acquiescence significantly predicted suggestibility, as did competence self-esteem scores, but global self-esteem and negative affect scores did not. False-memory production (i.e., false recall of implied words) was associated with higher levels of both acquiescence and negative affect, but the tendency to alter responses after criticism was not significantly predicted by any variable.

Adolescent↗

Competence to confess: measuring understanding and suggestibility of defendants with mental retardation.

Groups of individuals with or without mental retardation, all of whom were currently on probation, were tested with measures of comprehension of Miranda rights and of suggestibility. As in previous work, participants with mental retardation were found to be less able to comprehend their Miranda rights. In addition, they were significantly more likely to respond to suggestive questioning and to change their answers. Significant correlations were found between measures of comprehension of Miranda rights and measures of suggestibility. Implications of these results were discussed.

Adult↗

Eyewitness memory and suggestibility in children with mental retardation.

We examined how well children with mental retardation were able to recall a live staged event one day later compared to CA- and MA-comparable peers. Children with mental retardation performed very well on many measures of eyewitness memory performance, reaching the level of the CA-comparable group for free recall, general questions, open-ended questions, and correctly leading questions. They were, however, more suggestible in response to closed misleading questions than were children in the CA-comparable group, although they were not more suggestible than those in the MA-comparable group. Some relationships were found between a standardized measure of suggestibility and performance on the eyewitness memory task, but most of these relationships were not the same within each of our study groups.

Attention↗

Hypnosis and suggestion in a century of psychotherapy: an epistemological assessment.

From 1882 to 1982, a century of psychotherapy passed. Its inception was marked by the rehabilitation of hypnosis in the work of Charcot at the Salepêtrière, and in the Nancy School (Liébeault and Bernheim). The young Freud became acquainted with this work in the course of his visits to France at this same period. It was thus that he was put on the track leading to the discovery of psychoanalysis. With the concept of transference, Freud thought he was reabsorbing suggestion and placing affect under the control of cognition. But today it is realized that suggestion (direct and indirect) is ever-present in psychoanalysis, as in other psychotherapies, which indeed do not cease to proliferate. This common element might be an important constituent of the curative process. Under these circumstances, it seems highly desirable that suggestion and hypnosis, those "crossroad" concepts which still remain so mysterious, become the subject of basic research, notwithstanding the prejudices that are still very much alive. The results of such research would prove beneficial to psychotherapy, as well as to the other human sciences.

Austria↗

Hypnotic suggestion of stimulus change and visual cortical evoked potential.

Two experiments were conducted to determine whether the hypnotic suggestion of stimulus intensity change would affect the physical parameters (latencies, amplitudes) of the visual cortical evoked potential. Stimulus intensity was kept constant as visual cortical evoked potentials were measured under conditions in which it was suggested that stimuli were "bright" or "dim". The results of both experiments led to the conclusion that, under the present condition, hypnotic suggestion of stimulus intensity change did not result in changes in visual cortical evoked potentials.

Electrophysiology↗

Effect of a time-slowing suggestion on performance accuracy on a perceptual motor task.

Three female subjects were hypnotized and played a video-tennis game under alternating control and experimental conditions in a within-subjects ABABAB withdrawal design. During control phases, subjects played the game under conditions of hypnotic relaxation. Prior to experimental phases a suggestion for subjective time-slowing, and ball-slowing, was presented. The initial presentation of the time-slowing suggestion did not result in improved performance accuracy. However, for all subjects, the second and third presentation of the suggestion resulted in significantly more longer volleys during experimental periods as compared to control periods. Possible explanation of the processes underlying improved performance accuracy are discussed in light of the subjective reports of the participants.

Adult↗

Increase in cutaneous temperature induced by hypnotic suggestion of pain.

Eight patients with atopic eczema and six healthy subjects were given hypnotic suggestion to feel pain in the upper part of the back and in one case on the palm. An average local increase in skin temperature of 0.6 degrees C (detected by thermovision) occurred under this condition. For some patients cutaneous pain threshold was increased before the experiment by means of repetitive hypnotic suggestion of analgesia. These subjects reported feeling no pain subjectively, but the local change in skin temperature was equal in both cases. The results suggest a central mechanism induced by measuring changes in pain threshold in the skin, which changes are independent of local changes in blood flow.

Adolescent↗

Suggestion as an aid to self-regulation of hand temperature.

Five subjects were instructed to alter the temperature of the dominant hand (two increase, three decrease) with the aid of an augmented feedback display. On baseline days and on alternate training days, subjects were presented with slide projections and heard a tape-recorded sentence during every other intertrial interval during a 15-minute discrete trial period. On baseline days, the imagery and suggestions were neutral in nature; on training days they suggested thermal conditions appropriate to the subject's task. Subjects displayed a significantly larger temperature change in the instructed direction on suggestion than on nonsuggestion training days.

Biofeedback, Psychology↗

Role of suggestions in digital skin temperature: implications for temperature biofeedback research.

The purpose of the present experiment was to explore the role suggestions and assessment procedures play in affecting digital skin temperature. Four different types of suggestions were given subjects (warm, cool, pseudo (electronic terms), and no suggestions). Twenty-five subjects were randomly assigned to the four experimental conditions. The data were analyzed by three popular assessment procedures typically found in the literature. As predicted, subjects displayed significant decreases in skin temperature each day regardless of the training condition they were in. The assessment procedures produced differential results.

Biofeedback, Psychology↗

Source monitoring in eyewitness memory: implicit associations, suggestions, and episodic traces.

Both the distinctiveness heuristic and discrepancy detection hypotheses were investigated by independently manipulating both schema consistency and incidental suggestion in an eyewitness memory paradigm. A sequence of slides was shown, followed by a postevent questionnaire that contained both schema-typical and schema-atypical information. Fifteen minutes later, a source-monitoring task was administered. In Experiment 1, the proportion of source misattribution errors was greater for schema-typical items than for schema-atypical items, and the proportion of errors on suggested items was greater than that on control items. Suggestion affected schema-typical and schema-atypical items equally, providing no support for the predictions of either hypothesis. In Experiment 2, the interval between the questionnaire and the source test was manipulated. The results of Experiment 1 were replicated under the short delay, whereas the proportion of errors increased under the long delay. An associative network model involving two types of episodic traces was used to account for the results.

Association↗

The eyewitness suggestibility effect and memory for source.

We examined the possibility that eyewitness suggestibility reflects failures of the processes by which people normally discriminate between memories derived from different sources. To test this hypothesis, misled and control subjects were tested either with a yes/no recognition test or with a "source monitoring" test designed to orient subjects to attend to information about the sources of their memories. The results demonstrate that suggestibility effects obtained with a recognition test can be eliminated by orienting subjects toward thinking about the sources of their memories while taking the test. Our findings indicate that although misled subjects are capable of identifying the source of their memories of misleading suggestions, they nonetheless sometimes misidentify them as memories derived from the original event. The extent to which such errors reflect genuine memory confusions (produced, for example, by lax judgment criteria) or conscious misattributions (perhaps due to demand characteristics) remains to be specified.

Adolescent↗

[Effect of hypnosis and suggestion on the EEG-powerspectrum in the preparatory interval (author's transl)].

Fourier-analysis of the EEG (P4 02, P3 O1, CZ A1) in the stimulation period (1 sec) before acoustic stimulation showed significant differences between hypnosis and waking. Diminished power was found in the slower spectrum (0-3 and 4-7 c/sec) over the right hemisphere (P4O2) during hypnosis. Increased power was found in the alpha-spectrum (8-13 c/sec) over the Vertex (CZA1) during suggestion. We interpreted this effect as inhibition of exteroceptive perception during suggestion. Powerspectrum was averaged over 30 stimulation periods before acoustic stimulation with identic tones (sinus of 500 c/sec, 70 dB, duration 40 msec, stimulus interval 3--10 sec). The combination of experimental conditions (Hypnosis/Waking and Suggestions) were given in a balanced order to control seriel effects. We examined 12 persons in a repeated measurement design.

Adult↗