688:"The explanation used by Marks and Kammann clearly involves the use of Occam's razor. Marks and Kammann argued that the 'cues' - clues to the order in which sites had been visited - provided sufficient information for the results, without any recourse to extrasensory perception. Indeed Marks himself was able to achieve 100 per cent accuracy in allocating some transcripts to sites without visiting any of the sites himself, purely on the ground basis of the cues. From Occam's razor, it follows that if a straightforward natural explanation exists, there is no need for the spectacular paranormal explanation: Targ and Puthoff's claims are not justified."
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crept up to 28%. For those that occurred three times it was 38%, and for those targets that occurred six or more times, the hit rate was 52%. Each time a videotape is played its quality can degrade. It is plausible then, that when a frequently used clip is the target for a given session, it may be physically distinguishable from the other three decoy clips that are presented to the subject for judging. Surprisingly, the parapsychological community has not taken this finding seriously. They still include the autoganzfeld series in their meta-analyses and treat it as convincing evidence for the reality of psi.
239:'s remote viewing experiments. In a series of thirty-five studies, they were unable to replicate the results so investigated the procedure of the original experiments. Marks and Kammann discovered that the notes given to the judges in Targ and Puthoff's experiments contained clues as to which order they were carried out, such as referring to yesterday's two targets, or they had the date of the session written at the top of the page. They concluded that these clues were the reason for the experiment's high hit rates. According to
39:
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contained sensory cues. Marks and
Christopher Scott (1986) wrote "considering the importance for the remote viewing hypothesis of adequate cue removal, Tart's failure to perform this basic task seems beyond comprehension. As previously concluded, remote viewing has not been demonstrated in the experiments conducted by Puthoff and Targ, only the repeated failure of the investigators to remove sensory cues."
133:, 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.
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412:. "Today, researchers discount the first decade of Rhine's work with Zener cards. Stimulus leakage or cheating could account for all his findings. Slight indentations on the backs of cards revealed the symbols embossed on card faces. Subjects could see and hear the experimenter, and note subtle but revealing facial expressions or changes in breathing."
197:, randomization and security as well as possibilities of sensory leakage. Over half of the studies failed to safeguard against sensory leakage and all of the studies contained at least one of the 12 flaws. Because of the flaws, Honorton agreed with Hyman the 42 Ganzfeld studies could not support the claim for the existence of psi.
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data for independent examination when asked, but Targ and
Puthoff consistently refused to allow Marks and Kammann to see copies of the transcripts. Marks and Kammann were, however, able to obtain copies of the transcripts from the judge who used them. The transcripts were found to contain a wealth of cues.
111:
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
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had methodological problems that were well documented. Honorton reported only 36% of the studies used duplicate target sets of pictures to avoid handling cues. Hyman discovered flaws in all of the 42 Ganzfeld experiments and to assess each experiment, he devised a set of 12 categories of flaws. Six
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has written controlled tests by several other researchers, eliminating several sources of cuing and extraneous evidence present in the original tests, produced negative results. Students were also able to solve
Puthoff and Targ's locations from the clues that had inadvertently been included in the
247:
Examination of the few actual transcripts published by Targ and
Puthoff show that just such clues were present. To find out if the unpublished transcripts contained cues, Marks and Kammann wrote to Targ and Puthoff requesting copies. It is almost unheard of for a scientist to refuse to provide his
145:
whilst Sarah Owenby claimed to receive transmissions 250 miles away. For the experiment, Turner would think of a symbol and write it down whilst Owenby would write her guesses. The scores were highly successful and both records were supposed to be sent to J. B. Rhine, however, Owenby sent them to
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was performed by Lucien Warner and
Mildred Raible. The subject was locked in a room with a switch controlling a signal light elsewhere, which he could signal to guess the card. Ten runs with ESP packs of cards were used and he achieved 93 hits (43 more than chance). Weaknesses with the experiment
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The most suspicious pattern was the fact that the hit rate for a given target increased with the frequency of occurrence of that target in the experiment. The hit rate for the targets that occurred only once was right at the chance expectation of 25%. For targets that appeared twice the hit rate
468:. "Despite Rhine's confidence that he had established the reality of extrasensory perception, he had not done so. Methodological problems with his experiments eventually came to light, and as a result parapsychologists no longer run card-guessing studies and rarely even refer to Rhine's work."
259:
Most of the material in the transcripts consists of the honest attempts by the percipients to describe their impressions. However, the transcripts also contained considerable extraneous material that could aid a judge in matching them to the correct targets. In particular, there were numerous
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claimed that a rejudging of the transcripts from one of Targ and
Puthoff's experiments revealed an above-chance result. Targ and Puthoff again refused to provide copies of the transcripts and it was not until July 1985 that they were made available for study when it was discovered they still
260:
references to dates, times and sites previously visited that would enable the judge to place the transcripts in proper sequence... Astonishingly, the judges in the Targ-Puthoff experiments were given a list of target sites in the exact order in which they were used in the tests!
103:. His experiments were discredited due to the discovery that sensory leakage or cheating could account for all his results such as the subject being able to read the symbols from the back of the cards and being able to see and hear the experimenter to note subtle clues.
200:
Possibilities of sensory leakage in the
Ganzfeld experiments included the receivers hearing what was going on in the sender's room next door as the rooms were not soundproof and the sender's fingerprints to be visible on the target object for the receiver to see.
64:(1989) and Andrew Neher (2011) have studied the history of psi experiments from the late 19th century up until the 1980s. In every experiment investigated, flaws and weaknesses were discovered so the possibility of naturalistic explanations (such as
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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.
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Once Rhine took precautions in response to criticisms of his methods, he was unable to find any high-scoring subjects. Due to the methodological problems, parapsychologists no longer utilize card-guessing studies. Rhine's experiments into
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were later discovered. The duration of the light signal could be varied so that the subject could call for specific symbols and certain symbols in the experiment came up far more often than others which indicated either poor shuffling or
705:
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Turner. Critics pointed out this invalidated the results as she could have simply written her own record to agree with the other. When the experiment was repeated and the records were sent to Rhine the scores dropped to average.
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According to Marks, when the cues were eliminated the results fell to a chance level. Marks was able to achieve 100 per cent accuracy without visiting any of the sites himself but by using cues.
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Marks and Kamman concluded: "Until remote viewing can be confirmed in conditions which prevent sensory cueing the conclusions of Targ and
Puthoff remain an unsubstantiated hypothesis."
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Hyman also reviewed the auto-Ganzfeld experiments and discovered a pattern in the data that implied a visual cue may have taken place:
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Hyman wrote the auto-Ganzfeld experiments were flawed because they did not preclude the possibility of sensory leakage.
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is a term used to refer to information that transferred to a person by conventional means (other than
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of these concerned statistical defects, the other six covered procedural flaws such as inadequate
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For example, where the subject in an ESP experiment receives a visual cue—the reflection of a
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experiment was discovered to contain flaws. Frances May Turner positioned herself in the
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Pseudoscience and
Extraordinary Claims of the Paranormal: A Critical Thinker's Toolkit
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Assessing possible sender-to-experimenter acoustic leakage in the PRL autoganzfeld
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experiments confessed to fraud, the
Brugmans' experiment, the experiments by
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An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural
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177:
138:
61:
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How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life
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The establishment of data manipulation in the Soal-Shackleton experiments
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experiments were proven to be fraudulent, one of the subjects from the
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in the holder's glasses—sensory leakage can be said to have occurred.
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in Robert J. Sternberg, Henry L. Roediger, Diane F. Halpern. (2007).
387:
Paranormal and Transcendental Experience: A Psychological Examination
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68:) or deception and trickery were not ruled out. The data from the
37:
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The New Apocrypha: A Guide to Strange Sciences and Occult Beliefs
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The Elusive Quarry: A Scientific Appraisal of Psychical Research
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did not rule out the possibility of sensory cues or trickery.
23:) during an experiment into extrasensorial perception (ESP).
1082:
Association for the Scientific Study of Anomalous Phenomena
459:
Back from the Future: Parapsychology and the Bem Affair
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Information Transmission in Remote Viewing Experiments
592:
Information transmission in remote viewing experiments
678:
Beyond Belief: Skepticism, Science and the Paranormal
508:. The Journal of Parapsychology. Volume 66: 183-186.
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1201:
1188:
Princeton Engineering Anomalies Research Laboratory
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608:Sensory cues invalidate remote viewing experiments
1294:Old Souls: The Scientific Evidence for Past Lives
1102:International Association for Near-Death Studies
722:ESP and Parapsychology: A Critical Reevaluation
558:. Journal of Parapsychology. Volume 60: 97-128.
337:ESP and Parapsychology: A Critical Reevaluation
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1163:International Institute for Psychical Research
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1193:Society for the Study of Supernormal Pictures
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1301:Parapsychology: Frontier Science of the Mind
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188:studies that were examined by Ray Hyman and
570:. (2014).
535:. Cambridge University Press. pp. 216-231.
231:and Richard Kammann attempted to replicate
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1178:National Laboratory of Psychical Research
554:, Matthew Smith, Diana Kornbrot. (1996).
1315:Twenty Cases Suggestive of Reincarnation
1077:American Society for Psychical Research
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680:. Cambridge University Press. p. 106.
374:A Skeptic's Handbook of Parapsychology
7:
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1092:Institut MĂ©tapsychique International
506:A Response to Storm and Ertel (2002)
529:Evaluating Parapsychological Claims
1153:British College of Psychic Science
444:. Thomas Y. Crowell Company. p. 28
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1322:Varieties of Anomalous Experience
1266:Journal of Scientific Exploration
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762:Pseudoscience and the Paranormal
624:Pseudoscience and the Paranormal
426:Pseudoscience and the Paranormal
137:The Turner-Owenby long-distance
533:Critical Thinking in Psychology
428:. Prometheus Books. pp. 119-120
376:. Prometheus Books. pp. 287-312
1183:Oxford Phasmatological Society
1173:Metropolitan Psychical Society
1127:Society for Psychical Research
951:Parapsychology research at SRI
143:Duke Parapsychology Laboratory
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1252:Journal of Near-Death Studies
1112:Parapsychological Association
961:Plant perception (paranormal)
776:, Christopher Scott. (1986).
657:The Psychology of the Psychic
99:carried out experiments into
1148:American Psychical Institute
1107:Koestler Parapsychology Unit
1097:Institute of Noetic Sciences
321:The Psychology of the Occult
886:Electronic voice phenomenon
676:Martin Bridgstock. (2009).
654:, Richard Kammann. (1980).
590:, Richard Kammann. (1978).
398:Jonathan C. Smith. (2009).
323:. Derricke Ridgway, London.
149:A famous ESP experiment at
121:(PK) were also criticized.
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1214:Skeptics of parapsychology
1168:London Dialectical Society
1087:College of Psychic Studies
764:. Prometheus Books. p. 136
724:. Prometheus Books. p. 293
626:. Prometheus Books. p. 135
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176:Participant in a Ganzfeld
165:
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1259:Journal of Parapsychology
1209:List of parapsychologists
1117:Parapsychology Foundation
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442:ESP, Seers & Psychics
1308:The Roots of Coincidence
871:Dermo-optical perception
576:The Skeptic's Dictionary
305:The Skeptic's Dictionary
1238:Extrasensory Perception
1231:An Experiment with Time
1158:Cambridge Ghost Society
891:Extrasensory perception
841:Apparitional experience
708:. St. Martin's Griffin.
1376:Paranormal terminology
936:Out-of-body experience
778:Remote Viewing Exposed
491:. Panther. pp. 172-174
385:Andrew Neher. (2011).
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1141:Defunct organizations
1122:Rhine Research Center
926:Near-death experience
594:. Nature 274: 680–81.
438:Milbourne Christopher
389:. Dover Publications.
175:
127:
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95:In the 20th century,
41:
1070:Active organizations
956:Past life regression
660:. Prometheus Books.
642:. Free Press. p. 167
86:Joseph Gaither Pratt
906:Kirlian photography
896:Ganzfeld experiment
568:Robert Todd Carroll
404:. Wiley-Blackwell.
355:. Prometheus Books.
339:. Prometheus Books.
297:Robert Todd Carroll
186:Ganzfeld experiment
168:Ganzfeld experiment
162:Ganzfeld experiment
52:Scientists such as
866:Deathbed phenomena
780:. Nature 319: 444.
748:. Nature 284: 191.
610:. Nature 292: 177.
465:Skeptical Inquirer
227:The psychologists
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129:His research used
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941:Pam Reynolds case
846:Astral projection
317:Donovan Rawcliffe
156:card manipulation
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1370:Categories
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1046:Telepathy
881:Ectoplasm
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