Tim Brunson DCH

Welcome to The International Hypnosis Research Institute Web site. Our intention is to support and promote the further worldwide integration of comprehensive evidence-based research and clinical hypnotherapy with mainstream mental health, medicine, and coaching. We do so by disseminating, supporting, and conducting research, providing professional level education, advocating increased level of practitioner competency, and supporting the viability and success of clinical practitioners. Although currently over 80% of our membership is comprised of mental health practitioners, we fully recognize the role, support, involvement, and needs of those in the medical and coaching fields. This site is not intended as a source of medical or psychological advice. -- Tim Brunson, PhD

Meta-analysis of free-response studies, 1992-2008.



Full Title: Meta-analysis of free-response studies, 1992-2008: assessing the noise reduction model in parapsychology.

We report the results of meta-analyses on 3 types of free-response study: (a) ganzfeld (a technique that enhances a communication anomaly referred to as "psi"); (b) nonganzfeld noise reduction using alleged psi-enhancing techniques such as dream psi, meditation, relaxation, or hypnosis; and (c) standard free response (nonganzfeld, no noise reduction). For the period 1997-2008, a homogeneous data set of 29 ganzfeld studies yielded a mean effect size of 0.142 (Stouffer Z = 5.48, p = 2.13 x 10(-8)). A homogeneous nonganzfeld noise reduction data set of 16 studies yielded a mean effect size of 0.110 (Stouffer Z = 3.35, p = 2.08 x 10(-4)), and a homogeneous data set of 14 standard free-response studies produced a weak negative mean effect size of -0.029 (Stouffer Z = -2.29, p = .989). The mean effect size value of the ganzfeld database were significantly higher than the mean effect size of the nonganzfeld noise reduction and the standard free-response databases. We also found that selected participants (believers in the paranormal, meditators, etc.) had a performance advantage over unselected participants, but only if they were in the ganzfeld condition.

Psychol Bull. 2010 Jul;136(4):471-85. Storm L, Tressoldi PE, Di Risio L. School of Psychology, University of Adelaide, Adelaide, Australia. lance.storm@adelaide.edu.au

TrackBacks
There are no trackbacks for this entry.

Trackback URL for this entry:
http://www.hypnosisresearchinstitute.org/trackback.cfm?BF1CE665-C09F-2A3B-F6287751A16B7549

Comments
© 2000 - 2017The International Hypnosis Research Institute, All Rights Reserved.

Contact