Charles Honorton Sources:
Bem–Honorton Collaboration and Mainstream Replication
The 1994 collaboration between social psychologist Daryl Bem and parapsychologist Charles Honorton aimed to bring the ganzfeld database to the attention of mainstream psychology by publishing in a flagship general-psychology journal. The effort built on a methodologically reformed series of automated ganzfeld studies designed to satisfy criteria jointly negotiated with a leading critic. Honorton died of a heart attack shortly before the paper was accepted for publication.
Deeper dives, Honorton:
Key findings
- Honorton and the critic Ray Hyman issued a joint communiqué agreeing that the early ganzfeld database showed an overall significant effect not reasonably explained by selective reporting or multiple analysis, while continuing to differ over whether that effect was evidence for psi.1
- Following the communiqué, Honorton built a computer-automated ganzfeld system intended to comply with the jointly agreed methodological standards.2
- The autoganzfeld series of 11 experiments reported a significant overall direct-hit rate above mean chance expectation, with the database constructed to avoid a file-drawer problem by including every session run since the system’s inauguration.3
- Bem and Honorton presented the reformed ganzfeld evidence in Psychological Bulletin, framing replication rates and effect sizes as warranting the wider psychological community’s attention.4
- The paper appeared posthumously: Honorton died on November 4, 1992, nine days before the article was accepted.4
Overview
The Bem–Honorton collaboration was an attempt to translate a parapsychological research programme into the methodological and rhetorical vocabulary of mainstream experimental psychology. Honorton had spent the 1980s answering criticism of the manual ganzfeld procedure by automating it and by negotiating shared standards with a prominent critic; Bem, a Cornell social psychologist with no prior commitment to the field, joined as a co-author and brought the case to Psychological Bulletin.4 The ganzfeld is a free-response telepathy paradigm in which a receiver in a state of sensory attenuation, halved ping-pong balls over the eyes and white noise through headphones, attempts to describe imagery a remote sender is viewing; this is a deliberate reduction of patterned input, not total deprivation. The paradigm’s known vulnerability is its modest effect size and its sensitivity to procedural detail: hit-rate moderators such as sender–receiver acquaintance and dynamic versus static targets mean that an underpowered or loosely-controlled replication can plausibly yield a null without refuting the underlying claim.3
The Data Versus the Interpretation
It is essential to separate the experimental result from its proposed explanation. The data claim is a statistical one: across the 11 autoganzfeld experiments, 241 participants contributed 355 sessions, yielding 122 direct hits (34.4%) against a 25% chance baseline, an exact binomial p of .00005 (z = 3.89).3 The mechanism claim, that this reflects “anomalous processes of information or energy transfer”, was treated by Bem and Honorton as purely descriptive, neither implying the paranormal nor committing to an underlying physical account; the preferred interpretation was that some genuine anomalous communication occurs, while the authors acknowledged the explanation remained contested.4
Origins of the collaboration
The collaboration began not as an advocacy project but as an external audit. Bem first visited Honorton’s Psychophysical Research Laboratories in Princeton in 1983 as one of several outside consultants brought in to examine the design and implementation of the experimental protocols.4 That consulting relationship, a methodologist scrutinising the apparatus rather than a believer joining a cause, became the foundation of the eventual co-authorship, and it is one reason the 1994 paper foregrounds methodology over metaphysics.4
Honorton’s reform-minded stance predated Bem’s involvement. Through the early 1980s he had responded directly to critiques of the ganzfeld literature and had argued explicitly about how the replicability of parapsychological effects might be evaluated and improved.5 His response to early criticism of the psi-ganzfeld studies set out the proponent case that would later be tested against an automated protocol.6
From Consultant to Co-Author
The 1994 paper’s author note records the PRL funding context that the collaboration inherited: the experimental work was supported by the James S. McDonnell Foundation and the John E. Fetzer Foundation, with preparation of the article itself supported by grants to Honorton from the American Society for Psychical Research and the Parapsychology Foundation. Helpful comments on drafts were received from a roster of mainstream methodologists including Robert Rosenthal, Lee Ross, Jessica Utts, and Philip Zimbardo, an indication of the deliberate effort to subject the manuscript to non-partisan scrutiny before publication.4
The joint communiqué and reformed protocol
The methodological spine of the whole enterprise was the 1986 joint communiqué Honorton co-authored with the critic Ray Hyman. Rather than continue a published debate that had emphasised their differences, the two agreed to collaborate on a shared statement of what they could both endorse, to the authors’ knowledge the first time a parapsychologist and a critic had jointly produced a statement of this type.1 They agreed there was an overall significant effect in the early database that could not reasonably be explained by selective reporting or multiple analysis, while continuing to disagree over whether the effect amounted to evidence for psi; both sides held that the verdict awaited future experiments conducted by a broader range of investigators under more stringent standards.7
The communiqué made specific recommendations about randomisation, judging and feedback procedures, multiple analysis and statistics, and documentation, naming the precise artifacts (such as inadequate target randomisation and control of sensory leakage) that the earlier studies had departed from ideal standards on.1 Honorton’s own meta-analytic response to Hyman had laid the groundwork for these agreed points.8
What the Communiqué Conceded and What It Held
The communiqué is a methodology document, not an experimental result, and its evidential value lies in the structure it imposed on subsequent work. Hyman and Honorton jointly conceded that the early studies as a group departed from ideal standards on multiple testing, randomisation of targets, and controlling for sensory leakage; they agreed these flaws were real but contested whether they were sufficient to explain away the aggregate effect.1 The agreed standards then functioned as a preregistered specification against which the automated replication could be judged, a rare instance of an adversarial pair fixing the goalposts before the confirmatory data were collected.8
The autoganzfeld replication and the 1994 paper
To meet the agreed standards, Honorton designed a computer-automated ganzfeld system in which target selection, target presentation, the blind judging procedure, subject feedback, and data recording were all placed under computer control, allowing sessions to be run by a single target-blind experimenter.2 Rick Berger was the systems engineer who built the apparatus; Honorton was the principal investigator. The receiver sat in a sound-isolation room and the sender in a separate RF-shielded, sound-attenuated room fifteen feet away, with two electrically isolated audio systems, a design aimed squarely at the sensory-leakage artifact named in the communiqué.2
The autoganzfeld series comprised 11 experiments. To address selective reporting, the team included every session completed since the system’s inauguration in 1983, including pilot and ongoing studies, the authors stated explicitly that this database had no file-drawer problem.3 The primary hypothesis, that subjects would identify the actual target at above-chance rates, was specified in advance, with alpha set at .05 one-tailed; two secondary hypotheses (a dynamic-target advantage and a sender-acquaintance advantage) were also pre-specified, and the remaining analyses were labelled purely exploratory.3
The Autoganzfeld Numbers
The participant pool was 241 volunteers (100 men, 141 women), aged 17 to 74 (mean 37.3), a self-selected sample with strong prior belief in psi (mean 6.21 on a 7-point scale) and high rates of reported personal psi experience. Altogether they contributed 355 sessions; the 122 direct hits (34.4%) yielded an exact binomial p of .00005 (z = 3.89) against the 25% chance baseline.3 This was the confirmatory dataset that the 1994 paper summarised for a general-psychology readership, framing it against the competing meta-analyses of the earlier database by Hyman (1985) and Honorton (1985).4
Bem and Honorton’s Psychological Bulletin article reviewed the two competing meta-analyses of the original ganzfeld database, summarised the 11 new studies that complied with the Hyman–Honorton guidelines, and then discussed replication and theoretical explanation.4 The authors’ framing was cautious and rhetorical: they noted that most academic psychologists do not accept psi, that the term is purely descriptive, and that their claim was specifically that the replication rates and effect sizes were now sufficient to warrant the wider community’s attention, not that the matter was settled.4 The article appeared posthumously: Honorton died of a heart attack on November 4, 1992, nine days before the paper was accepted, listed at his final affiliation in the Department of Psychology at the University of Edinburgh.4
The Edinburgh Continuation
After PRL lost its funding and closed in 1989, Honorton moved to Edinburgh to work with Robert Morris’s Koestler Chair group, where the intention was to set up the same automated system with different colleagues in a different place. That Edinburgh effort produced further methodological work on the automated ganzfeld, including a review of the security measures built into the system to safeguard against fraud and protocol deviation by both experimenters and participants, a direct continuation of the artifact-mitigation programme that the communiqué had specified.9
Skeptical Critiques and Discussion
Critique 1: The early ganzfeld database was too methodologically flawed to support any psi conclusion.
In the critical appraisal of the ganzfeld experiments co-authored with Hyman, the case was made that the original studies departed from ideal standards on multiple testing, target randomisation, and control of sensory leakage, such that the aggregate effect could plausibly be an artifact rather than evidence of psi.10
Honorton’s response and his meta-analysis of the same database argued that the effect survived assessment of selective reporting and showed no systematic relationship between study outcome and rated research quality, and the two parties ultimately agreed in the joint communiqué that the overall effect could not reasonably be explained by selective reporting or multiple analysis.81
Analysis. Hyman and Honorton’s published positions converged in the communiqué on the existence of a significant aggregate effect while diverging on its interpretation; the critic continued to regard the flaws as potentially explanatory and the proponent regarded them as insufficient to account for the result. Both agreed the dispute would be resolved by future experiments conducted under the jointly specified standards rather than by re-litigating the original studies. The autoganzfeld series was the response built to those standards.
Critique 2: Positive ganzfeld results could reflect a file-drawer of unreported null studies.
Selective reporting, the suppression of non-significant studies, is a standing concern for any meta-analytic claim, and the joint communiqué named multiple analysis and selective reporting among the issues the field needed to address.1
The autoganzfeld programme was structured to remove the file-drawer mechanism directly: the team included every session completed since the system’s inauguration in 1983, including pilot and ongoing studies, and stated explicitly that the resulting database had no file-drawer problem.3 The earlier precognition meta-analysis applied a quantitative selective-reporting test, finding that a large ratio of unreported null studies per reported study would be required to reduce the result to nonsignificance.11
Analysis. The autoganzfeld design addressed the file-drawer concern at the level of data collection rather than post-hoc correction, by committing to report every session from a fixed start date. Whether a complete-capture claim is fully verifiable depends on independent audit of the laboratory’s records, which the published reports assert but a single laboratory cannot externally guarantee. The precognition meta-analysis offered a separate, quantitative fail-safe estimate for a different database, illustrating the tools available rather than settling the ganzfeld case.
References
- Hyman, R., & Honorton, C. (2019). A Joint Communiqué: The Psi Ganzfeld Controversy. Journal of Parapsychology, 82(3), 108–117. https://doi.org/10.30891/jopar.2018s.01.09 R001 [Hyman 2019] ↩︎
- Berger, R. E., & Honorton, C. (1986). Automated Psi Ganzfeld. Research in Parapsychology 1985, 85–88. R002 [Berger 1986] ↩︎
- Honorton, C., Berger, R. E., Varvoglis, M. P., Quant, M., Derr, P., Schechter, E. I., & Ferrari, D. C. (1990). Psi communication in the ganzfeld: Experiments with an automated testing system and a comparison with a meta-analysis of earlier studies. Journal of Parapsychology, 54(2), 99–139. R003 [Honorton 1990] ↩︎
- Bem, D. J., & Honorton, C. (1994). Does psi exist? Replicable evidence for an anomalous process of information transfer. Psychological Bulletin, 115(1), 4–18. https://doi.org/10.1037/0033-2909.115.1.4 R004 [Bem 1994] ↩︎
- Honorton, C. (1985). How to evaluate and improve the replicability of parapsychological effects. In The Repeatability Problem in Parapsychology (pp. 238–255). Parapsychology Foundation. R005 [Honorton 1985] ↩︎
- Honorton, C. (1983). Response to Hyman’s critique of psi ganzfeld studies. Scarecrow Press. R006 [Honorton 1983] ↩︎
- Hyman, R., & Honorton, C. (1986). A joint communique: the psi ganzfeld controversy. Journal of Parapsychology, 50(4), 350–364. R007 [Hyman 1986] ↩︎
- Honorton, C. (1985). Meta-analysis of psi ganzfeld research: A response to Hyman. Journal of Parapsychology, 49(1), 51–91. R008 [Honorton 1985] ↩︎
- Dalton, K., Morris, R. L., Delanoy, D. L., Radin, D. I., & Honorton, C. (1996). Security measures in an automated ganzfeld system. Journal of Parapsychology, 60(2), 129–147. https://koestlerunit.wordpress.com/wp-content/uploads/2015/06/dalton-et-al-1996.pdf R009 [Dalton 1996] ↩︎
- Hyman, R., Honorton, C., & Saunders, D. (1985). The Ganzfeld Psi experiment: a critical appraisal. Journal of Parapsychology, 49(1), 3–91. R010 [Hyman 1985] ↩︎
- Honorton, C., & Ferrari, D. C. (1989). “Future telling”: A meta-analysis of forced-choice precognition experiments, 1935–1987. Journal of Parapsychology, 53(4), 281–308. R011 [Honorton 1989] ↩︎