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Extrasensory Perception

Extrasensory perception (ESP) is the apparent ability to acquire information by paranormal means independent of any known physical senses or deduction from previous experience. The term was coined by Duke University researcher J. B. Rhine to denote psychic abilities such as telepathy,the sensing of thoughts or feelings without help from the 5 known senses, precognition, the knowledge of future events, and clairvoyance, the awareness of people, objects or events without the help of the 5 known senses. ESP is also sometimes casually referred to as a sixth sense, gut instinct, a hunch, a weird vibe or an intuition. The term implies sources of information currently unexplained by science. Popular belief in ESP is widespread, but skeptics are still not persuaded that there truly is a sixth sense because of the lack of reliable theories and information.[1][2][3]

The existence of ESP abilities is highly controversial, and no scientifically conclusive demonstrations of the existence of ESP have been given.[1] Parapsychology explores this possibility, and some experiments such as the ganzfeld have been suggested as good evidence of ESP, but the scientific community outside parapsychology does not generally accept the existence of ESP.[4][5]

History of ESP

The notion of extrasensory perception existed in antiquity. In many ancient cultures, such powers were ascribed to people who purported to use them for second sight or communicate with deities, ancestors, spirits, and the like.

Extrasensory Perception and Hypnosis

There is a common belief that a hypnotized person would be able to demonstrate ESP. Carl Sargent, a psychology major at the University of Cambridge, heard about the early claims of a hypnosis – ESP link and designed an experiment to test whether they had merit. He recruited 40 fellow college students, none of whom identified themselves as having ESP, and then divided them into a group that would be hypnotized before being tested with a pack of 25 Zener cards, and a control group that would be tested with the same Zener cards. The control subjects averaged a score of 5 out of 25 right, exactly what chance would indicate. The subjects who were hypnotized did more than twice as well, averaging a score of 11.9 out of 25 right. Sargent’s own interpretation of the experiment is that ESP is associated with a relaxed state of mind and a freer, more atavistic level of consciousness.[citation needed]

J.B. Rhine

In the 1930s, at Duke University in North Carolina, J. B. Rhine and his wife Louisa tried to develop psychical research into an experimental science. To avoid the connotations of hauntings and the seance room, they renamed it “parapsychology.” While Louisa Rhine concentrated on collecting accounts of spontaneous cases, J. B. Rhine worked largely in the laboratory, carefully defining terms such as ESP and psi and designing experiments to test them. A simple set of cards was developed, originally called Zener cards[6] (after their designer)—now called ESP cards. They bear the symbols circle, square, wavy lines, cross, and star; there are five cards of each in a pack of 25.

In a telepathy experiment the “sender” looks at a series of cards while the “receiver” guesses the symbols. To try to observe clairvoyance, the pack of cards is hidden from everyone while the receiver guesses. To try to observe precognition, the order of the cards is determined after the guesses are made.

In all such experiments the order of the cards must be random so that hits are not obtained through systematic biases or prior knowledge. At first the cards were shuffled by hand, then by machine. Later, random number tables were used and, nowadays, computers. An advantage of ESP cards is that statistics can easily be applied to determine whether the number of hits obtained is higher than would be expected by chance. Rhine used ordinary people as subjects and claimed that, on average, they did significantly better than chance expectation. Later he used dice to test for psychokinesis and also claimed results that were better than chance.

In 1940, Rhine, J.G. Pratt, and others at Duke authored a review of all card-guessing experiments conducted internationally since 1882. Titled Extra-Sensory Perception After Sixty Years, it has become recognised as the first meta-analysis in science.[7] It included details of replications of Rhine’s studies. Through these years, 50 studies were published, of which 33 were contributed by investigators other than Rhine and the Duke University group; 61% of these independent studies reported significant results suggestive of ESP.[8] Among these were psychologists at Colorado University and Hunter College, New York, who completed the studies with the largest number of trials and the highest levels of significance.[9][10] Replication failures encouraged Rhine to further research into the conditions necessary to experimentally produce the effect. He maintained, however, that it was not replicability, or even a fundamental theory of ESP that would evolve research, but only a greater interest in unconscious mental processes and a more complete understanding of human personality.[11]

Early British Research

One of the first statistical studies of ESP, using card-guessing, was conducted by Ina Jephson, in the 1920s. She reported mixed findings across two studies. More successful experiments were conducted with procedures other than card-guessing. G.N.M. Tyrrell used automated target-selection and data-recording in guessing the location of a future point of light. Whateley Carington experimented on the paranormal cognition of drawings of randomly selected words, using participants from across the globe. J. Hettinger studied the ability to retrieve information associated with token objects.

Less successful was University of London mathematician Samuel Soal in his attempted replications of the card-guessing studies. However, following a hypothesis suggested by Carington on the basis of his own findings, Soal re-analysed his data for evidence of what Carington termed displacement. Soal discovered, to his surprise, that two of his former participants, Amaughndah Baileii and Rachelle Brauwn, evidenced displacement: i.e., their responses significantly corresponded to targets for trials one removed from which they were assigned. Soal sought to confirm this finding by testing these participants in new experiments. Conducted during the war years, into the 1950s, under tightly controlled conditions, they produced highly significant results suggestive of precognitive telepathy. His findings were especially convincing for many other scientists and philosophers regarding telepathy and the claims of Rhine. Critics offered claims of fraud, the invalidity of probability theory to science, and the possibility of unconscious whispering, as accounting for Soal’s results. These charges against Soal, and spirited defenses by his colleagues, continued until after his death in 1975. In 1978, parapsychologists largely abandoned any further defence of the findings when a computer-based analysis identified inexplicable sequences in the target lists used for one of Soal’s experiments.

Sequence, Position and Psychological Effects

Rhine and other parapsychologists found that some subjects, or some conditions, produced significant below-chance scoring (psi-missing); or that scores declined during testing (the “decline effect”).[citation needed] Personality measures have also been tested. People who believe in psi (“sheep”) tend to score above chance, while those who do not believe in psi (“goats”) show null results or psi-missing. This has became known as the “sheep-goat effect”.(Schmeidler G., 1945)

Prediction of decline and other position effects has proved challenging, although they have been often identified in data gathered for the purpose of observing other effects.[12] Personality and attitudinal effects have shown greater predictability, with meta-analysis of parapsychological databases showing the sheep-goat effect, and other traits, to have significant and reliable effects over the accumulated data.[13][14]

Cognitive and Humanistic Research

In the 1960s, in line with the development of cognitive psychology and humanistic psychology, parapsychologists became increasingly interested in the cognitive components of ESP, the subjective experience involved in making ESP responses, and the role of ESP in psychological life. Memory, for instance, was offered as a better model of psi than perception. This called for experimental procedures that were not limited to Rhine’s favoured forced-choice methodology. Free-response measures, such as used by Carington in the 1930s, were developed with attempts to raise the sensitivity of participants to their cognitions. These procedures included relaxation, meditation, REM-sleep, and the Ganzfeld (a mild sensory deprivation procedure). These studies have proved to be even more successful than Rhine’s forced-choice paradigm, with meta-analyses evidencing reliable effects, and many confirmatory replication studies.[15][16] Methodological hypotheses have still been raised to explain the results, while others have sought to advance theoretical development in parapsychology on their bases. Moving research out of the laboratory and into naturalistic settings, and taking advantage of naturally occurring conditions, has been a related development.

Parapsychological Investigation of ESP

The study of psi phenomena such as ESP is called parapsychology. The consensus of the Parapsychological Association is that certain types of psychic phenomena such as psychokinesis, telepathy, and precognition are well established.[17][4][18]

A great deal of reported extrasensory perception is said to occur spontaneously in conditions which are not scientifically controlled. Such experiences have often been reported to be much stronger and more obvious than those observed in laboratory experiments. These reports, rather than laboratory evidence, have historically been the basis for the extremely widespread belief in the authenticity of these phenomena. However, it has proven extremely difficult (perhaps impossible) to replicate such extraordinary experiences under controlled scientific conditions.[4]

Those who believe that ESP may exist point to numerous studies that appear to offer evidence of the phenomenon’s existence: the work of J. B. Rhine, Russell Targ, Harold E. Puthoff and physicists at SRI International in the 1970s, and many others, are often cited in arguments that ESP exists.

The main current debate concerning ESP surrounds whether or not statistically compelling laboratory evidence for it has already been accumulated.[19][4] The most compelling and repeatable results are all small to moderate statistical results. Some dispute the positive interpretation of results obtained in scientific studies of ESP, because they are difficult to reproduce reliably, and are small effects. Parapsychologists have argued that the data from numerous studies show that certain individuals have consistently produced remarkable results while the remainder have constituted a highly significant trend that cannot be dismissed even if the effect is small.[20]


Among scientists in the National Academy of Sciences, 96% described themselves as “skeptical” of ESP, although 2% believed in psi and 10% felt that parapsychological research should be encouraged.[21] The National Academy of Sciences had previously sponsored the Enhancing Human Performance report on mental development programs, which was critical of parapsychology.[22]

A scientific methodology that shows statistically significant evidence for ESP with nearly 100% consistency has not been discovered. The lack of a viable theory of the mechanism behind ESP is also frequently cited as a source of skepticism. Historical cases in which flaws have been discovered in the experimental design of parapsychological studies, and the occasional cases of fraud marred the field.[23]

Critics of experimental parapsychology hold that there are no consistent and agreed-upon standards by which “ESP powers” may be tested, in the way one might test for, say, electrical current or the chemical composition of a substance. It is argued that when psychics are challenged by skeptics and fail to prove their alleged powers, they assign all sorts of reasons for their failure, such as that the skeptic is affecting the experiment with “negative energy.”


  1. Britannica Online Encyclopedia, Retrieved Oct 7, 2007.
  2. “Glossary of Key Words Frequently Used in Parapsychology”. Parapsychological Association. Retrieved on 2006-12-24.
  3. “Definition of extrasensory perception”. Merriam-Webster OnLine. Retrieved on 2007-09-06.
  4. The Conscious Universe: The Scientific Truth of Psychic Phenomena by Dean I. Radin Harper Edge, ISBN 0-06-251502-0
  5. Robert Todd Carroll. “ESP (extrasensory perception)”. Skeptic’s Dictionary. Retrieved on 2007-06-23.
  6. Vernon, David [1989]. in (ed.) Donald Laycock, David Vernon, Colin Groves, Simon Brown: Skeptical – a Handbook of Pseudoscience and the Paranormal. Canberra, Australia: Canberra Skeptics, p28. ISBN 0731657942.
  7. Bösch, H. (2004). “Reanalyzing a meta-analysis on extra-sensory perception dating from 1940, the first comprehensive meta-analysis in the history of science” in 47th Annual Convention of the Parapsychological Association..
  8. Honorton, C., “Error some place!”, Journal of Communication (25): 103-116
  9. Martin, D.R., & Stribic, F.P. (1938). Studies in extrasensory perception: I. An analysis of 25, 000 trials. Journal of Parapsychology, 2, 23-30.
  10. Riess, B.F. (1937). A case of high scores in card guessing at a distance. Journal of Parapsychology, 1, 260-263.
  11. Rhine, J.B. (1966). Foreword. In Pratt, J.G., Rhine, J.B., Smith, B.M., Stuart, C.E., & Greenwood, J.A. (eds.). Extra-Sensory Perception After Sixty Years, 2nd ed. Boston, US: Humphries.
  12. Beloff, J. (1986). Retrodiction. Parapsychology Review, 17 (1), 1-5.
  13. Lawrence, T. R. (1993). Gathering in the sheep and goats: A meta-analysis of forced-choice sheep-goat ESP studies, 1947-1993. Proceedings of the Parapsychological Association 36th Annual Convention, pp. 75-86
  14. Honorton, C., Ferrari, D. C., & Bem, D. J. (1998). Extraversion and ESP performance: A meta-analysis and a new confirmation. Journal of Parapsychology, 62 (3), 255-276.
  15. Sherwood, S. J. & Roe, C. (2003). A review of dream ESP studies conducted since the Maimonides studies. Journal of Consciousness Studies, 10, 85-109.
  16. Bem, D. J. et al.(2001). Updating the Ganzfeld database. Journal of Parapsychology, 65, 207-218.
  17. Criticism and Controversy in Parapsychology – An Overview By Eberhard Bauer, Department of Psychology, University of Freiburg, in the European Journal of Parapsychology, 1984, 5, 141-166, Retrieved February 9, 2007
  18. What is the state-of-the-evidence for psi? Retrieved January 31, 2007
  19. Entangled Minds: Extrasensory Experiences in a Quantum Reality by Dean I. Radin, Simon & Schuster, Paraview Pocket Books, 2006 ISBN-13: 978-1416516774
  20. Psychological Bulletin 1994, Vol. 115, No. 1, 4-18. Does Psi Exist? Replicable Evidence for an Anomalous Process of Information Transfer By Daryl J. Bem and Charles Honorton
  21. McConnell, R.A., and Clark, T.K. (1991). “National Academy of Sciences’ Opinion on Parapsychology” Journal of the American Society for Psychical Research, 85, 333-365.
  22. Retrieved February 4, 2007
  23. Carroll, Robert Todd (2005). “ESP (extrasensory perception)”. The Skeptic’s Dictionary. Retrieved on 2006-09-13.

Further reading

  • Kelly, Theresa M.(2013) Quantum Psychics – Scientifically Understand, Enhance and Control Your Psychic Ability,
    Charleston, South Carolina USA (ISBN: 9780557034024).
  • The Conscious Universe, by Dean Radin, Harper Collins, 1997, ISBN 0-06-251502-0.
  • Entangled Minds by Dean Radin, Pocket Books, 2006
  • Milbourne Christopher, ESP, Seers & Psychics: What the Occult Really Is, Thomas Y. Crowell Co., 1970, ISBN 0-690-26815-7
  • Milbourne Christopher, Mediums, Mystics & the Occult by Thomas Y. Crowell Co, 1975
  • Milbourne Christopher, Search for the Soul , Thomas Y. Crowell Publishers, 1979
  • Georges Charpak, Henri Broch, and Bart K. Holland (tr), Debunked! ESP, Telekinesis, and Other Pseudoscience, (Johns Hopkins University). 2004, ISBN 0-8018-7867-5
  • Hoyt L. Edge, Robert L. Morris, Joseph H. Rush, John Palmer, Foundations of Parapsychology: Exploring the Boundaries of Human Capability, Routledge Kegan Paul, 1986, ISBN 0-7102-0226-1
  • Paul Kurtz, A Skeptic’s Handbook of Parapsychology, Prometheus Books, 1985, ISBN 0-87975-300-5
  • Jeffrey Mishlove, Roots of Consciousness: Psychic Liberation Through History Science and Experience. 1st edition, 1975, ISBN 0-394-73115-8, 2nd edition, Marlowe & Co., July 1997, ISBN 1-56924-747-1 There are two very different editions. online
  • Schmeidler, G. R. (1945). Separating the sheep from the goats. Journal of the American Society for Psychical Research, 39, 47–49.
  • John White, ed. Psychic Exploration: A Challenge for Science, published by Edgar D. Mitchell and G. P. Putman, 1974, ISBN 0-399-11342-8
  • Richard Wiseman, Deception and self-deception: Investigating Psychics. Amherst, USA: Prometheus Press. 1997
  • Benjamin B. Wolman, ed, Handbook of Parapsychology, Van Nostrand Reinhold, 1977, ISBN 0-442-29576-6
  • Myers, David G. Psychology. Accessed on December 9, 2004. Contains information concerning the Randi Foundation tests.

External Resources

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