The Ganzfeld Protocol, Psi Phenomena
Standing
Concerns Key Experiment
Currently States The 1986 Hyman-Honorton joint communique agreed pooled ganzfeld results exceeded chance and could not be explained by selective reporting alone, while disagreeing on whether they demonstrated psi, and set standards for future studies.
Wolfgang Metzger developed the ganzfeld, whole field, technique for ordinary perceptual psychology in the 1930s, and Charles Honorton adapted it for psi testing from the early 1970s, later building the automated autoganzfeld series at the Psychophysical Research Laboratories. Ray Hyman, of the University of Oregon, identified methodological weaknesses in the early ganzfeld meta-analyses Honorton's studies fed into, and the two co-authored a 1986 joint communique setting out agreed findings, remaining disagreements and standards required of future ganzfeld research. The method is a sensory-deprivation free-response protocol tested and re-tested across the decades since, and the specific key experiment at issue, whether a properly controlled ganzfeld session can produce a reliably above-chance result, remains the central unresolved methodological dispute in modern experimental parapsychology. Because later meta-analyses applying the 1986 standards have themselves disagreed over which studies qualify, the dispute Hyman and Honorton documented in 1986 is not settled by either side as of the present.
Source A Joint Communique: The Psi Ganzfeld Controversy, Ray Hyman, Charles Honorton