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Failure to Replicate Results of Bem Parapsychology Experiments Published by Same Journal

By Kendrick Frazier via the Committee for the Scientific Investigation of Claims of the Paranormal


Psychologist Daryl Bem

Two years ago the prepublication re­lease of a research paper by psychologist Daryl Bem claiming experimental evidence for precognition created a worldwide media stir and intense controversy within the scientific and skeptical communities.

Bem, of Cornell University, claimed that through nine experiments he had demonstrated the existence of precognition, specifically the existence of “conscious cognitive awareness . . . of a future event that could not otherwise be anticipated through any known inferential process.” Essentially, he had claimed to have produced evidence that psychic abilities not only exist but can transcend time and allow the future to reach backward to change the past.

Informed critics of parapsychology were almost uniformly incredulous. Although Bem is a respected psychologist, they found so many flaws in the research protocols and methods that in their view the conclusions had no validity. One of the most stinging re­bukes came in the form of an ex­tended, in-depth critique of all nine experiments by York University psychologist and CSI Executive Council member James Alcock in the Skeptical Inquirer (“Back from the Future: Parapsy­chology and the Bem Affair,” SI, March/April 2011; see also editorial “Why the Bem Experiments are Not Parapsychology’s Next Big Thing” in the same issue).

Alcock also concluded that the journal that published Bem’s study, the Journal of Personality and Social Psy­chology (JPSP), had done everyone a disservice by publishing this “badly flawed research article.” Parapsy­chology and the journal’s own reputation, he wrote, had been damaged, and the article’s publication disserved the public as well, “for it only adds to [public] confusion about the existence of psi.”

Why don't you remember this headline?

Why don’t you remember this headline?

Experiments attempting to replicate Bem’s results were quickly conducted at various universities, but none were accepted for publication by JPSP. In fact, it said it would not consider publishing replication failures. This fact raised more controversy and concern.

Now the journal has had an apparent change of heart. It has finally published a set of experiments that attempted (and failed) to replicate Bem’s results. Seven experiments conducted by Jeff Galek of Carnegie Mellon University, Robyn A. LeBoeuf of the University of Florida, Leif D. Nelson of the Uni­versity of California at Berkeley, and Joseph P. Simmons of the University of Pennsylvania have been published in JPSP’s final issue of 2012 (Vol. 103, No. 6) under the title “Correcting the Past: Failures to Replicate Psi.”

The article is lengthy, but the central conclusion is succinctly stated:

“Across seven experiments (N= 3,289), we replicate the procedure of Experiments 8 and 9 from Bem (2011), which had originally demonstrated retroactive facilitation of recall. We failed to replicate that finding.” They further conducted a meta-analysis of all replication attempts of the Bem experiments “and find that the average effect size (d=0.04) is not different from 0.”

To put it even more directly (from the beginning of their conclusions section): “We conducted seven experiments testing for precognition and found no evidence supporting its existence.”

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