Rhine's results have never been duplicated by the
scientific community. A number of psychological departments attempted to repeat Rhine's experiments but failed. W. S. Cox (1936) from
Princeton University with 132 subjects produced 25,064 trials in a playing-card ESP experiment. Cox concluded "There is no evidence of extrasensory perception either in the 'average man' or of the group investigated or in any particular individual of that group. The discrepancy between these results and those obtained by Rhine is due either to uncontrollable factors in experimental procedure or to the difference in the subjects." The American psychologist
James Charles Crumbaugh attempted to repeat Rhine's findings over a long period without success. Crumbaugh wrote: At the time [1938] of performing the experiments involved I fully expected that they would yield easily all the final answers. I did not imagine that after 28 years I would still be in as much doubt as when I had begun. I repeated a number of the then current Duke techniques, but the results of 3,024 runs [one run consists of twenty-five guesses] of the ESP cards as much work as Rhine reported in his first book-were all negative. In 1940 I utilized further methods with high school students, again with negative results. It was charged that Rhine's experiments into
extrasensory perception (ESP) contained methodological flaws. The psychologists
Leonard Zusne and Warren Jones have written that "the keeping of records in Rhine’s experiments was inadequate. Sometimes, the subject would help with the checking of his or her calls against the order of cards. In some long-distance telepathy experiments, the order of the cards passed through the hands of the percipient before it got from Rhine to the agent." According to
Terence Hines:The methods the Rhines used to prevent subjects from gaining hints and clues as to the design on the cards were far from adequate. In many experiments, the cards were displayed face up, but hidden behind a small wooden shield. Several ways of obtaining information about the design on the card remain even in the presence of the shield. For instance, the subject may be able sometimes to see the design on the face-up card reflected in the agent’s glasses. Even if the agent isn’t wearing glasses it is possible to see the reflection in his cornea. In 1938,
Harold Gulliksen wrote that Rhine did not describe his experimental methods clearly and used inappropriate mathematical procedures which overestimated the significance of his results. Rhine published
Extra-Sensory Perception After Sixty Years in 1940 with a number of colleagues, to address the objections raised. In the book, Rhine and his colleagues described three experiments—the
Pearce-Pratt experiment, the
Pratt-Woodruff experiment and the Ownbey-Zirkle series—which they believed demonstrated ESP. The psychologist
C. E. M. Hansel wrote "it is now known that each experiment contained serious flaws that escaped notice in the examination made by the authors of
Extra-Sensory Perception After Sixty Years". Rhine's experiments into
psychokinesis (PK) were not replicated by other scientists.
John Sladek wrote: His research used dice, with subjects 'willing' them to fall a certain way. Not only can dice be drilled, shaved, falsely numbered and manipulated, but even straight dice often show bias in the long run. Casinos for this reason retire dice often, but at Duke, subjects continued to try for the same effect on the same dice over long experimental runs. Not surprisingly, PK appeared at Duke and nowhere else. The science writer
Martin Gardner wrote that Rhine repeatedly tried to replicate his work, but produced only failures that he never reported. Gardner criticized Rhine for not disclosing the names of assistants he caught cheating: His paper "Security Versus Deception in Parapsychology" published in his journal (vol. 38, 1974), runs to 23 pages... Rhine selects twelve sample cases of dishonest experimenters that came to his attention from 1940 to 1950, four of whom were caught 'red-handed'. Not a single name is mentioned. What papers did they publish, one wonders? This has suggested to Gardner that Rhine practiced a "secrecy policy". Gardner mentioned inside information that files in Rhine's laboratory contain material suggesting fraud on the part of
Hubert Pearce. Pearce was never able to obtain above-chance results when persons other than the experimenter were present during an experiment, making it more likely that he was cheating in some way. Rhine's other subjects were only able to obtain non-chance levels when they were able to shuffle the cards, which has suggested they used tricks to arrange the order of the
Zener cards before the experiments started. Rhine's colleague Walter Levy was exposed as falsifying data for an animal ESP test, which harmed the reputation of Rhine and of parapsychology, regardless of whether Rhine was personally involved. According to
James Alcock, due to Rhine's errors, parapsychologists no longer utilize card-guessing studies. Rhine has been described as credulous as he believed the horse "
Lady Wonder" was telepathic but it was discovered the owner was using subtle signals to control the horse's behavior. Historian
Ruth Brandon has written that Rhine's research was not balanced or objective, instead "motivated by the most extreme ideology" of
vitalism. ==Books==