Most NLP Practitioners trust the empirical evidence that what they are doing works, but the following article collects some of the research data currently available to support their experience. Some NLP techniques are simply "modeled" on techniques used and researched in other fields (Ericksonian Hypnosis and Classical Conditioning being the two main examples) and in these fields NLP is an accelerated methodology for learning these techniques, rather than the originator of them. In other cases research from the field of Psychology supports the theoretical basis of NLP techniques, which have not been fully researched as yet (a key example being the phenomenon called "Submodalities" in NLP). Finally some specific research on NLP's own developed techniques does exist.
The NLP Model Of Sensory System Use And The NLP Spelling Strategy. One of the most important claims made by NLP is that people think in specific sensory languages, and these types of thought can be accessed by changing the direction the subject's eyes look to.
This proposition is well described in:
Neuro-Linguistic Programming: Volume 1 by Dilts, R., Grinder, J., Bandler, R. and DeLozier, J. Meta, Cupertino, 1980
The following experiment supports this notion, and it's application to memorising the spelling of words. F. Loiselle at the University of Moncton in New Brunswick, Canada (1985) selected 44 average spellers, as determined by their pretest on memorizing nonsense words. Instructions in the experiment, where the 44 were required to memorize another set of nonsense words, were given on a computer screen. The 44 were divided into four subgroups for the experiment.
Group One were told to visualize each word in the test, while looking up to the left.
Group Two were told to visualize each word while looking down to the right.
Group Three were told to visualize each word (no reference to eye position).
Group Four were simply told to study the word in order to learn it.
The results on testing immediately after were that Group One (who did actually look up left more than the others, but took the same amount of time) increased their success in spelling by 25%, Group Two worsened their spelling by 15%, Group Three increased their success by 10%, and Group Four scored the same as previously. This strongly suggests that looking up left (Visual Recall in NLP terms) enhances spelling, and is twice as effective as simply teaching students to picture the words. Furthermore, looking down right (Kinesthetic in NLP terms) damages the ability to visualize the words. Interestingly, in a final test some time later (testing retention), the scores of Group One remained constant, while the scores of the control group, Group Four, plummeted a further 15%, a drop which was consistent with standard learning studies. The resultant difference in memory of the words for these two groups was 61%.
Thomas Malloy at the University of Utah Department of Psychology completed a study with three groups of spellers, again pre-tested to find average spellers. One group were taught the NLP spelling strategy of looking up and to the left, one group were taught a strategy of sounding out by phonetics and auditory rules, and one were given no new information. In this study the tests involved actual words. Again, the visual recall spellers improved 25%, and had near 100% retention one week later. The group taught the auditory strategies improved 15% but this score dropped 5% in the following week. The control group showed no improvement.
These studies support the NLP Spelling Strategy specifically, and the NLP notion of Eye Accessing Cues, Sensory system use, and Strategies in general. They are reported in: Dilts, R. and Epstein, T., Dynamic Learning, Meta, Capitola, California,1995
The NLP Model of Sensory Representational System Use The claim that which sensory system you talk in makes a difference to your results with specific clients was tested by Michael Yapko. He had 30 graduate students in counseling, and had them listen to three separate taped trance inductions. Each induction used language from one of the main sensory systems (visual, auditory and kinesthetic). Subjects were assessed before to identify their preference for words from these sensory systems. After each induction, their depth of trance was measured by electromyography and by asking them how relaxed they felt. On both measures, subjects achieved greater relaxation when their preferred sensory system was used.
Yapko. M., "The Effects of Matching Primary Representational System Predicates on Hypnotic Relaxation." in the American Journal of Clinical Hypnosis, 23, p169-175, 1981
The NLP Model Of Association-Dissociation And The NLP Phobia/Trauma Process Several small scale studies support the success of the NLP Phobia cure, which is based on the NLP model of Dissociation. In each this case the treatment, which takes about 10 minutes, is the standard one taught on NLP Practitioner courses.
Denholtz M.S., and Mann, E.T., "An automated audiovisual treatment of phobias administered by non-professionals" in the Journal of Behavior Therapy and Experimental Psychiatry (6, p 111-115), 1975. The first report of the use of the technique, suggesting it may have some merits.
Allen, K., "An Investigation of the Effectiveness of Neuro Linguistic Programming Procedures in treating Snake Phobias" (in Dissertation Abstracts International 43, 861B), 1982. This study of 36 undergraduate students with
snake phobias found the NLP process behaviorally as successful as far longer Systemic Desensitization regimes, and more convincing subjectively to the participants. Einspruch, E. "Neurolinguistic Programming in the Treatment of Phobias" in Psychotherapy in Private Practice, 6(1): 91-100, 1988 In this study from the University of Miami Phobia Trauma Clinic, 31 phobic clients were seen in group therapy, and 17 in individual therapy. The subjects were given
questionnaires before and after therapy, and these suggest that the technique is successful for symptoms of both anxiety and depression in clients with phobias.
Koziey, P., and McLeod, G., "Visual kinesthetic Dissociation in Treatment of Victims of Rape" in Professional Psychology; Research and Practice, 18(3); 276-282,1987 The study, from the University of Alberta, showed the reduction of anxiety in teenage rape victims, and recommends the use of the process in cases of trauma.