Visual Memory Processing During Hypnosis: Does it Differ from Waking?
Cognitive processing differences in waking and hypnotic states have been suggested by several studies. While previous studies have examined self-reports of imagery vividness (Coe et al., 1980; Sanders, 1967), this paper presents a series of investigations using more objective visual memory tasks to investigate the hypothesis that hypnosis can facilitate imagery processing such that either visual memory is better encoded or the preferred mode of scanning visual information is shifted within the highly hypnotizable individual.
Two studies, using low hypnotizables (6 and 10 Ss) and high hypnotizables (6 and 10), as assessed by the Standford Hypnotic Susceptibility Scale, Form C, studied visual memory processing in counterbalanced conditions of waking and hypnosis. Based on the methodology of Gur and Hilgard (1975), subjects were presented Meier Art Design (Meier, 1940) pictures successively, such that subjects viewed one picture for 10 seconds, saw nothing for 10 seconds, and then were given a second picture with one object changed from the first. In both studies the lows and highs did not differ in the waking state, but during hypnosis the highs were able to identify significantly more often the object difference in the picture than were the lows. Self reports of visual memory strategy used indicated that both lows and highs reported a predominant detail memory encoding strategy during the waking state. During hypnosis the lows continued doing the same strategy, but the highs reported a shift to a predominant holistic image memory encoding strategy.
A third study, now in progress, investigates the full range of hypnotizability with conditions of task motivation instructions and simulating subjects. Similar tasks are being used.
Results are discussed as being complementary to Paivio’s (1971) imagery based dual-coding theory and to the hypothesis that hypnosis may facilitate a shift towards holistic, imaginai cognitive functioning.
KeywordsVisual Memory Visual Imagery Waking Condition Information Processing Strategy Holistic Strategy
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- Coe, W.C., St. Jean, R. L., and Burger, J. M., 1980, Hypnosis and the enhancement of visual imagery, Int.J.clin.exp.Hypnosis, 28:225–243.Google Scholar
- Crawford, H. J., Can hypnosis enhance visual imagery processing and memory? Paper presented at national meeting of The Society for Clinical and Experimental Hypnosis, Denver, Colorado, October, 1979.Google Scholar
- Crawford, H. J., Crawford, K., and Koperski, B., Does hemispheric lateralization change during hypnosis? Paper presented at national meeting of The Society for Clinical and Experimental Hypnosis, Chicago, October, 1980.Google Scholar
- Crawford, H. J., Nomura, K., and Slater H., Spatial memory processing: Enhancement during hypnosis. Paper presented at national meeting of the American Association for the Study of Mental Imagery, Yale University, New Haven, Conn., June, 1981.Google Scholar
- Hilgard, E. R., 1965, Hypnotic Susceptibility, N.Y., Harcourt, Brace, and Janovitch.Google Scholar
- Hilgard, E. R., 1977, Divided consciousness: Multiple control in human thought and action, N.Y., John Wiley and Sons.Google Scholar
- Julesz, G., 1971, Foundations of cyclopean perception, Chicago, Ill., University of Chicago Press.Google Scholar
- Karlin, R. A., Goldstein, L., Cohen, A., Morgan, D., and Berman, A., Attention, imagination and brain function. Paper presented at national meeting of the American Association for the Study of Mental Imagery, Yale University, New Haven, Conn., June 1981.Google Scholar
- Levin, L. A., and Harrison, R. H., 1976, Hypnosis and regression in the service of the ego, Int.J.clin.exp.Hypnosis, 24:400–418.Google Scholar
- MacLeod-Morgan, C., 1979, Hypnotic susceptibility, EEG Theta and Alpha waves, and hemispheric specificity, in: “Hypnosis 1979,” G. D. Burrows, D. R. Collison, and L. Dennerstein, eds., Holland, Ellsevier/North Holland Biomedical Press.Google Scholar
- Meier, N. C., 1940, The Meier Art Tests I. Art Judgment, Iowa City, Iowa, Bureau of Educational Research and Service, University of Iowa.Google Scholar
- Nomura, K., Crawford, H. J., and Slater, H., Eidetic imagery: Can it be reinstated during hypnotic age regression? Paper presented at the annual meeting of the Rocky Mountain Psychological Association, Denver, Colorado, May 1981.Google Scholar
- Paivio, A., 1971, Imagery and verbal processes, N.Y., Holt, Rinehart and Winston.Google Scholar
- Richardson, J. T. E., 1980, Mental imagery and human memory, N.Y., St. Martin’s Press.Google Scholar
- Sanders, S., 1967, The effect of hypnosis on visual imagery, Dissert.Absts.Intern., 30:2936-B.Google Scholar
- Sheehan, P. W., 1979, Hypnosis and the processes of imagination, in: “Hypnosis: Developments in Research and New Perspectives,” E. Fromm and R. E. Shor, eds., N.Y., Aldine.Google Scholar
- Shor, R. E., and Orne, E. M., 1962, Harvard Group Scale of Hypnotic Susceptibility, Form A., Palo Alto, Calif., Consulting Psychologists Press.Google Scholar
- Wallace, B., 1978, Restoration of eidetic imagery via hypnotic age regression: More evidence, 87:673–675.Google Scholar
- Weitzenhoffer, A. M., and Hilgard, E. R., 1962, Stanford Hypnotic Susceptibility Scale, Form C., Palo Alto, Calif., Consulting Psychologists Press.Google Scholar