An experimental study of "hypnotic" (auditory and visual) hallucinations.

78 unselected female volunteers were individually pretested on response to direct suggestions designed to evoke auditory and visual hallucinations. In the same experimental session each S was retested on equivalent hallucination suggestions after the administration of 1 of the following 3 experimental treatments, with 26 Ss assigned at random to each treatment: standardized hypnotic induction procedure, brief task motivating instructions, control (no hypnotic induction or task motivating instructions). On the pretests (base level tests), 54% stated that they heard the suggested sounds and 33% reported that they saw the suggested object. Analyses of covariance indicated that: (a) the standardized hypnotic induction procedure and the brief task motivating instructions both facilitated response to the suggestions to hallucinate, (b) the group given the hypnotic induction and the group given task motivating instructions did not differ significantly from each other, and (c) both of these groups were significantly more responsive to the suggestions than the control group. (30 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Moderating effects of contextual variables on the relationship between hypnotic susceptibility and suggested analgesia.

Assessed 75 undergraduates high, medium, or low on hypnotic susceptibility (the Carleton University Responsiveness to Suggestion Scale) on the cold pressor task before and after 1 of 3 instructional treatments. The treatments were (a) brief instructions to try to reduce pain, (b) the same analgesia instructions preceded by a hypnotic induction procedure, and (c) no hypnotic induction or instructions. In the hypnotic treatment, susceptibility correlated significantly with reductions in reported pain, and high-susceptible Ss reported significantly larger pain reductions than did control Ss. In the instruction-alone treatment, there was no significant relationship between susceptibility and pain reduction, and Ss at all 3 susceptibility levels reduced reported pain significantly more than did controls and as much as did high-susceptible hypnotic Ss. Findings suggest that the correlation between hypnotic susceptibility and hypnotic analgesia is moderated by Ss' attitudes and expectancies concerning their own performance in situations defined as related to hypnosis. (23 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparative efficacy of behavioral training, training plus relaxation, and a sleep/trance hypnotic induction in increasing hypnotic susceptibility.

A social-learning-based behavioral training procedure and the same procedure with the addition of progressive relaxation instructions were compared with a traditional sleep/trance eye-fixation hypnotic induction; Ss were 45 adult volunteers who had completed the Standard Hypnotic Susceptibility Scale, Form C. As predicted, the hypothesis that a social-learning training procedure would be more effective than a sleep/trance induction was supported. The hypothesis that the addition of relaxation instructions would further potentiate the social-learning treatment was not supported. Results suggest that for Ss of low and medium hypnotic susceptibility, social-learning procedures are a more effective way of increasing suggestibility than a sleep/trance induction. Changes in Ss' conceptions of hypnosis, particularly in terms of moving toward a self-control viewpoint, are hypothesized to be an intervening variable. (48 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Integration of orthographic, conceptual, and episodic information on implicit and explicit tests.

Examined how a prior encoding episode affected the integration of orthographic and conceptual information during incidental and intentional retrieval. 180 college students studied word lists with either shallow (counting vowels in each word) or deep (rating pleasantness) encoding tasks. Half of the Ss received implicit or explicit test instructions for a word fragment completion test containing orthographic cues (letters) and semantically related words. In the implicit condition, the word fragments had to be completed, while the explicit condition involved a memory test for the words seen earlier. On both the implicit and explicit tests, performance improved with an increase in the number of letters and words. Conceptual information processing had a larger effect in intentional retrieval than in incidental retrieval. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The propensity of the "highly hypnotizable" to act as if highly hypnotizable.

Assessed the tendency of hypnotically suggestible Ss to act as if hypnotically suggestible. 24 high and 24 low suggestible (determined using the Carleton University Responsiveness to Suggestion Scale) psychology students rated the aesthetic attractiveness of geometric figures. Prior to this task, information about how other Ss had rated the figures was provided. In a relevant data condition, information about others' ratings included appraisals apparently made by highly suggestible persons. In an irrelevant data condition, none of the information about others' ratings made reference to hypnotic suggestibility. The tendency to role enact as if highly suggestible was exhibited only within the relevant data condition and only by high suggestibles. Results cannot be explained in terms of hypnotically enhanced compliance because no hypnosis was present when the enactment occurred. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of experimenter modeling, demands for honesty, and initial level of suggestibility on response to "hypnotic" suggestions.

Pretested 180 college students on behavioral (objective) and experiential (subjective) responses to the test suggestions of the Barber Suggestibility Scale. After being exposed to 1 of 3 treatments--E modeling, hypnotic induction, or control--each S was retested on the same scale. Strong demands to give honest experiential reports were administered to 1/2 of the Ss under each treatment. Ss who were exposed to E modeling manifested a greater enhancement in objective responsiveness to test suggestions than control Ss and as much enhancement as Ss who were exposed to hypnotic induction. E modeling was as effective as hypnotic induction in enhancing sujective responsiveness to test suggestions with and without demands for honest reports. Under both the E modeling and hypnotic induction treatments, Ss who had initially manifested a high level of suggestibility (pretest) showed as much enhancement in subjective responsiveness to test suggestions as medium- or low-suggestible Ss. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Some characteristics of posthypnotic amnesia.

This experiment investigated (a) the differences in post-hypnotic amnesic characteristics of Ss with high and low hypnotic susceptibility and (b) the extent of the amnesia. The experimental Ss were presented 6 words under hypnosis with instructions for amnesia. The simulation Ss pretended they were hypnotized and received the words with instructions for posthypnotic amnesia. The control Ss were given the words with instructions only to remember them. Recognition, recall, and associative tests, administered immediately after, assessed the amnesia. Posthypnotic amnesia impaired recall and recognition among the experimental Ss, but did not reduce the availability of the words as associative responses. The simulating Ss overplayed their amnesic role and also showed impaired performance on the associative tests. (15 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Toward a theory of hynotic behavior: Effects on suggestibility of task motivating instructions and attitudes toward hypnosis.

Attitudes toward hypnosis were assessed in 75 college students. 3 weeks later the students were required to participate in an experiment in which they were tested individually on the Barber Suggestibility Scale. The scale was administered under 3 experimental treatments with 25 Ss, ? with positive attitudes toward hypnosis and ? with nonpositive attitudes, assigned randomly to each treatment. The treatments were: Task Motivating Instructions, Hypnotic Induction Procedure, Direct Suggestions (Control). The findings confirmed Hypotheses 1 and 2 which stated: (a) Ss given either brief task motivating instructions or a procedure of the type traditionally termed a hypnotic induction show greater response to suggestions than Ss given neither task motivating insructions nor a hypnotic induction; and (b) brief task motivating instructions and an extended hypnotic induction procedure both elicit high levels of suggestibility. (46 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Influence of instructions on hypnotic and nonhypnotic performance.

This study examined the performance of high- and low-susceptible Ss under hypnotic and waking conditions when exhortative, analgesic, and other instructions were separately controlled and not confounded. 50 female Ss, assigned to 1 of 3 experimental or 2 control groups, performed 2 maximum effort tasks (Hand Dynamometer and Weight Endurance) and 1 skilled task (Tremor) in a Base Rate and a Special Instruction session. Except for 1 control group that always performed awake, all Ss performed both hypnotized and awake in both sessions. Special instructions facilitated performance in the hypnotic but not the waking state, and exhortative were more effective than analgesic instructions. (16 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Age-related differences in memory as a function of imagery processing.

The effects of aging on imagery production and use (following the learning of concrete and abstract words) and their relations to subsequent memory performance were explored in 2 experiments. Both experiments demonstrated better free recall of concrete than of abstract words (the concreteness effect). Exp 1 showed this superiority to be greater for young Ss only under explicit imagery instructions. Exp 2 revealed that the advantage of concrete over abstract words reflects the use of differential imagery production. The results are discussed in terms of age differences in imagery utilization and the effects of visual processing on recall. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Expert judgments of hypnosis from subjective state reports.

Suggestibility was assessed in 60 college students after a traditional hypnotic induction, an alert induction, progressive relaxation training, or instruction in goal-directed imagery. Responsiveness to suggestion did not differ between groups. Ss also generated open-ended reports of their states of awareness and of their experience of 3 hypnotic suggestions. A sample of these reports from 24 moderately to highly suggestible Ss were evaluated by 18 experts in the field of hypnosis. Expert ratings of Ss' open-ended reports indicated that (1) traditional hypnotic inductions produce a state of consciousness that is indistinguishable from nonhypnotic relaxation training, (2) the subjective experience of hypnotic suggestions after imagination training is indistinguishable from that after hypnotic inductions, and (3) suggestibility is unrelated to state of consciousness as assessed by experts. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Suggested ("hypnotic") visual hallucinations: Experimental and phenomenological data.

Tested 74 female student nurses' responses to a pretreatment hallucination suggestion to see an object that was not present. Each S was then exposed to either hypnotic induction procedure or task motivational instructions, and was again tested on response to an equivalent posttreatment hallucination suggestion. Next, each S was assessed on the Barber Suggestibility Scale (BSS) and on a self-rating of hypnotic depth measure. Finally, Ss were interviewed individually by a "blind" E to determine their phenomenological experiences during the posttreatment hallucination suggestion. There were significant positive correlations between scores on the posttreatment hallucination suggestion and scores on the BSS, self-ratings of hypnotic depth, and pretreatment hallucination suggestion. Similar phenomenological experiences were reported by Ss tested under the hypnotic induction and task motivational treatments, and by Ss who reported that they "saw" and those who reported that they "vividly imagined" the suggested object. (22 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The relationship between visual memory function and lesions detected by magnetic resonance imaging after closed head injury.

45 patients (aged 16–73 yrs) with closed head injuries were followed up 6 mo postinjury with magnetic resonance imaging (MRI) and neuropsychological assessments. Ss were tested on visual and verbal measures of short-term memory and learning: pattern span, pattern learning, path span, path learning, digit span, and digit learning. Visual memory for patterns and paths was tested using a recall procedure. Compared with 22 controls (aged 15–70 yrs), Ss were significantly impaired on pattern span. Ss were also significantly impaired on measures of path learning and digit learning. Performance on the visual memory tasks was related to a rating of ventricular enlargement derived from MRI. It appears that diffuse damage remains of importance in predicting neuropsychological impairment in head injury. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Increasing hypnotic susceptibility by means of positive expectancies and written instructions.

Investigated the extent to which hypnotic susceptibility could be modified by means of induced positive expectancies and written instructions that were designed to correct misconceptions concerning hypnosis as well as to provide concrete methods for experiencing hypnosis. 40 undergraduates were given a baseline test of hypnotic susceptibility and then randomly assigned to 1 of 4 conditions. Ss receiving the positive expectancy were given false personality test feedback that they were good hypnotic Ss prior to a criterion hypnotic scale. Ss receiving the written instructions were given 10 min to read the information prior to the hypnotic test. Other Ss browsed through magazines prior to testing in hypnosis. Both positive expectancies and written instructions were significantly effective in increasing susceptibility in comparison with practice only. Theoretical explanations are advanced and the implications of these findings are considered. (26 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sensory deprivation and the enhancement of hypnotic susceptibility.

Investigated the effect of sensory deprivation upon hypnotic susceptibility. 10 volunteer college-age females initially resistant to hypnosis were placed in a light- and sound-attenuated sensory deprivation cubicle for a maximum of 6 hr. or until sensory deprivation phenomena were elicited. A hypnotic induction was undertaken via a communication system, while S remained in the deprivation cubicle, at a point when E judged that the sensory deprivation was sufficiently intense. Approximately 1 wk. following the experimental session, Ss submitted once again to a standard induction procedure. A control group of resistant Ss was included. Only the experimental group manifested a significant enhancement of hypnotic susceptibility, and this new level of susceptibility was maintained in the follow-up session. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Hypnotic elimination of prism-induced aftereffects: Perceptual effect or responses to experimental demands?

Two experiments assessed adaptation to displacing prisms in hypnotically limb-anesthetized Ss. Exp I with 18 college students disconfirmed the hypothesis that the displacement aftereffect is eliminated in limb-anesthetized hypnotic Ss who adapt to prisms in the absence of a visual target. Such Ss showed as large a displacement aftereffect as control Ss who received neither a hypnotic induction procedure nor an anesthesia suggestion. Exp II with 30 undergraduates demonstrated that under some testing conditions hypnotic Ss complied with experimental demands and eliminated the behavioral but not the perceptual component of the aftereffect. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of contextual organization on spatial memory of middle-aged and older women.

Examined the memory performance of 20 women aged 31–59 yrs and 20 aged 65–85. Ss reconstructed spatial arrays, replacing miniature objects in either a contextually organized panorama or a noncontextually organized bank of cubicles. Performance of the middle-aged Ss did not differ between the 2 tasks. Older Ss performed as well as middle-aged Ss in the panorama task, but in the cubicles task their scores were lower than in the panorama task and lower than those of the younger Ss in the cubicles task. Results support the conclusion that in a task that allows the use of existing contextual organization as a memory aid, age differences in memory performance disappear. Age differences may be limited to tasks that remove previously learned relationships between items (as in recall of lists of unrelated words), requiring Ss to invent an organizational structure to facilitate recall. Though such tasks predominate in research, they probably do not represent the memory problems met in everyday life, especially by older adults. (30 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Hypnotically induced limb anesthesia and adaptation to displacing prisms: A failure to confirm.

Tested 3 groups of 10 undergraduates for accuracy of pointing at a visual target before and after wearing displacing prisms. One group consisted of highly susceptible Ss given a hypnotic suggestion for limb anesthesia following the pretest, and a 2nd group included low susceptible Ss instructed to fake limb anesthesia. A control group unselected on susceptibility received no special instructions. The high susceptibles reported significantly greater felt anesthesia than Ss in the other 2 treatments. Nevertheless, Ss in all 3 groups showed very large displacement errors (i.e., errors in pointing) following prism removal. Results fail to confirm reports that placement errors were eliminated by hypnotic suggestion in highly susceptible Ss. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Conditional reasoning, representation, and level of abstraction.

This study examined the idea that (1) reasoning involves construction of mental representations (models) of premises and that (2) there is a developmental progression in the ability of Ss to reason with models containing concrete and abstract elements. Exp 1 found that for 13- and 16-yr-old Ss, reasoning with abstract content was more difficult than with concrete content. Younger Ss appeared to rely more on concrete representations that used real-world knowledge than on more general abstract representations. Exp 2 explored order effects in the presentation of concrete and abstract problems. Abstract followed by concrete problems led to reduced concrete-problem performance for high school students but did not affect performance for university students. These results support the hypotheses and suggest that development of formal reasoning abilities goes through 2 levels. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Artifact in the "essence of hypnosis": An evaluation of trance logic.

Assigned 70 female student nurses to 1 of 3 treatment conditions: hypnotic induction, instructions to simulate hypnosis, or imagination control. All Ss were assessed on M. Orne's (see record 1960-05341-001) 2 indexes of trance logic (the transparent and the double hallucination). The imagination controls consistently showed trance logic as often as the hypnotic Ss. Depending upon the stringency of the criterion for hallucination, the simulating Ss showed trance logic less often, as often, or more often than the hypnotic Ss and the imagination controls. In the 2nd phase of the investigation, 6 simulating Ss consistently manifested trance logic as often as 5 highly selected "somnambulistic" hypnotic Ss. Since trance logic was not found to be a discriminating characteristic of hypnotic Ss, investigators who seek the "essence of hypnosis" must now search elsewhere. (25 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)