Paranormal

 ( 1920s Neologisms ) 

Paranormal events are purported phenomena described in popular culture, folklore, and other non-scientific bodies of knowledge, whose existence within these contexts is described as being beyond the scope of normal scientific understanding. Notable paranormal beliefs include those that pertain to extrasensory perceptions (for example, telepathy), and the of ghost hunting, cryptozoology, and ufology.

Proposals regarding the paranormal are different from hypothesis or speculations extrapolated from scientific evidence because scientific ideas are grounded in empiricism observations and experimental data gained through the scientific method. In contrast, those who argue for the existence of the paranormal explicitly do not base their arguments on empirical evidence but rather on anecdote, testimony and suspicion. The standard scientific models give the explanation that what appears to be paranormal phenomena is usually a misinterpretation, misunderstanding or anomalous variation of natural science.

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Etymology The term paranormal has existed in the English language since at least 1920. "Paranormal". In odisha "Paranormal". In Dictionary.com. The word consists of two parts: and normal. The definition implies that the scientific explanation of the world around us is normal and anything that is above, beyond, or contrary to that is para.

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Paranormal subjects On the classification of paranormal subjects, psychologist Terence Hines said in his book Pseudoscience and the Paranormal (2003):

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Ghost hunting Ghost hunting is the investigation of locations that are reportedly haunted by . Typically, a ghost-hunting team will attempt to collect evidence supporting the existence of paranormal activity.

In traditional ghostlore, and fiction featuring ghosts, a ghost is a manifestation of the spirit or soul of a person. Alternative theories expand on that idea and include belief in the ghosts of deceased animals. Sometimes the term "ghost" is used synonymously with any spirit or demon; however, in popular usage the term typically refers to the spirit of a deceased person.

The belief in ghosts as souls of the departed is closely tied to the concept of animism, an ancient belief that attributed souls to everything in nature.

As the 19th-century anthropologist George Frazer explained in his classic work, The Golden Bough (1890), souls were seen as the 'creature within' which animated the body.

James George Frazer (1993). 9781853263101, Wordsworth Editions Ltd. . ISBN 9781853263101

Although the human soul was sometimes symbolically or literally depicted in ancient cultures as a bird or other animal, it was widely held that the soul was an exact reproduction of the body in every feature, even down to the clothing worn by the person. This is depicted in artwork from various ancient cultures, including such works as the Book of the Dead (), which shows deceased people in the afterlife appearing much as they did before death, including the style of dress.

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Ufology The possibility of extraterrestrial life is not, in itself, a paranormal subject. Many scientists are actively engaged in the search for unicellular life within the Solar System, carrying out studies on the surface of Mars and examining meteors that have fallen to Earth. Projects such as SETI are conducting an astronomical search for radio activity that would show evidence of intelligent life outside the Solar System. Evolution of how life developed on Earth allow for the possibility that life also developed on other . The paranormal aspect of extraterrestrial life centers largely around the belief in unidentified flying objects (UFOs) and the phenomena said to be associated with them.

Early in the history of UFO culture, believers divided themselves into two camps. The first held a rather conservative view of the phenomena, interpreting them as unexplained occurrences that merited serious study. They began calling themselves "Ufology" in the 1950s and felt that logical analysis of sighting reports would validate the notion of extraterrestrial visitation.

The second camp held a view that coupled ideas of extraterrestrial visitation with beliefs from existing quasi-religious movements. Typically, these individuals were enthusiasts of occultism and the paranormal. Many had backgrounds as active Theosophists or spiritualists, or were followers of other esoteric doctrines. In contemporary times, many of these beliefs have coalesced into New Age spiritual movements.

Both Secularity and spiritual believers describe UFOs as having abilities beyond what are considered possible according to known Aerodynamics constraints and Scientific law. The transitory events surrounding many UFO sightings preclude any opportunity for the repeat testing required by the scientific method. Acceptance of UFO theories by the larger scientific community is further hindered by the many possible associated with UFO culture.

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Cryptozoology Cryptozoology is a pseudoscience and subculture that aims to prove the existence of entities from the folklore record, such as Bigfoot, , or Mokele-mbembe. Cryptozoologists refer to these entities as cryptids, a term coined by the subculture.

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Paranormal research Approaching the paranormal from a research perspective is often difficult because of the lack of acceptable physical evidence from most of the purported phenomena. By definition, the paranormal (or supernatural) does not conform to conventional expectations of nature. Therefore, a phenomenon cannot be confirmed as paranormal using the scientific method because, if it could be, it would no longer fit the definition.In fact, the paranormal is often discussed as essentially something that resides within the human psyche, inherently contingent on its time and place; Ármann Jakobsson, The Troll Inside You: Paranormal Activity in the Medieval North. Earth, Milky Way: Punctum Books, 2017. (However, confirmation would result in the phenomenon being reclassified as part of science.) Despite this problem, studies on the paranormal are periodically conducted by researchers from various disciplines. Some researchers simply study the beliefs in the paranormal regardless of whether the phenomena are considered to objectively exist. This section deals with various approaches to the paranormal: anecdotal, , and participant-observer approaches and the skeptical investigation approach.

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Anecdotal approach An anecdotal approach to the paranormal involves the collection of stories told about the paranormal.

Charles Fort (1874–1932) is perhaps the best-known collector of paranormal anecdotes. Fort is said to have compiled as many as 40,000 notes on unexplained forteana, though there were no doubt many more. These notes came from what he called "the orthodox conventionality of Science", which were odd events originally reported in magazines and newspapers such as The Times and scientific journals such as Scientific American, Nature and Science. From this research Fort wrote seven books, though only four survive: The Book of the Damned (1919), New Lands (1923), Lo! (1931) and Wild Talents (1932); one book was written between New Lands and Lo!, but it was abandoned and absorbed into Lo!

Reported events that he collected include teleportation (a term Fort is generally credited with coining); poltergeist events; falls of frogs, fishes, and inorganic materials of an amazing range; crop circles; unaccountable noises and explosions; spontaneous fires; levitation; ball lightning (a term explicitly used by Fort); unidentified flying objects; mysterious appearances and disappearances; giant wheels of light in the oceans; and animals found outside their normal ranges (see phantom cat). He offered many reports of OOPArts, the abbreviation for "out of place" artifacts: strange items found in unlikely locations. He is perhaps the first person to explain strange human appearances and disappearances by the hypothesis of alien abduction and was an early proponent of the extraterrestrial hypothesis.

Fort is considered by many as the father of modern paranormalism, which is the study of the paranormal.

The magazine Fortean Times continues Charles Fort's approach, regularly reporting anecdotal accounts of the paranormal.

Such anecdotal collections, lacking the reproducibility of Empirical, are not amenable to scientific investigation. The anecdotal approach is not a scientific approach to the paranormal because it leaves verification dependent on the credibility of the party presenting the evidence. Nevertheless, it is a common approach to investigating paranormal phenomena.

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Parapsychology Experimental investigation of the paranormal has been conducted by parapsychology. J. B. Rhine popularized the now famous methodology of using card-guessing and dice-rolling experiments in a laboratory in the hopes of finding evidence of extrasensory perception.Hines, Terence (2003). pp. 119–120. However, it was revealed that Rhine's experiments contained methodological flaws and procedural errors.

(2025). 9780309073097, Joseph Henry Press. ISBN 9780309073097

Hines, Terence (2003). p. 122. "The procedural errors in the Rhine experiments have been extremely damaging to his claims to have demonstrated the existence of ESP. Equally damaging has been the fact that the results have not replicated when the experiments have been conducted in other laboratories."

In 1957, the Parapsychological Association was formed as the preeminent society for parapsychologists. In 1969, they became affiliated with the American Association for the Advancement of Science.

Criticisms of the field were focused in the creation (in 1976) of the Committee for the Scientific Investigation of Claims of the Paranormal (now called the Committee for Skeptical Inquiry) and its periodical, the Skeptical Inquirer. Eventually, more mainstream scientists became critical of parapsychology as an endeavor, and statements by the National Academies of Science and the National Science Foundation cast a pall on the claims of evidence for parapsychology. Today, many cite parapsychology as an example of a pseudoscience.Stenger, Victor J. (1990). p. 192. "Today, parapsychology is widely regarded as a pseudoscience.... Over a century it has been tainted by fraud, incompetence, and a general unwillingness to accept the verdict of conventional scientific method."

(2025). 9780226051963, University Of Chicago Press. ISBN 9780226051963

Parapsychology has been criticized for continuing investigation despite being unable to provide convincing evidence for the existence of any psychic phenomena after more than a century of research.Hines, Terence (2003). p. 144. "It is important to realize that, in one hundred years of parapsychological investigations, there has never been a single adequate demonstration of the reality of any psi phenomenon."

Luis A. Cordón (2025). 9780313324574, Greenwood Press. ISBN 9780313324574

By the 2000s, the status of paranormal research in the United States had greatly declined from its height in the 1970s, with the majority of work being privately funded and only a small amount of research being carried out in university laboratories. In 2007, Britain had a number of privately funded laboratories in university psychology departments. Publication remained limited to a small number of niche journals, and to date there have been no experimental results that have gained wide acceptance in the scientific community as valid evidence of the paranormal.

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Participant-observer approach While parapsychologists look for quantitative evidence of the paranormal in laboratories, a great number of people immerse themselves in qualitative research through participant-observer approaches to the paranormal. Participant-observer methodologies have overlaps with other essentially qualitative approaches, including phenomenological research that seeks largely to describe subjects as they are experienced, rather than to explain them.

Edmund Husserl (1970). 9780710066183, Routledge Kegan Paul Books. ISBN 9780710066183

Participant observation suggests that by immersing oneself in the subject that is being studied, a researcher is presumed to gain understanding of the subject. Criticisms of participant observation as a data-gathering technique are similar to criticisms of other approaches to the paranormal, but also include an increased threat to the scientific objectivity of the researcher, unsystematic gathering of data, reliance on Subjectivity measurement, and possible observer effects (i.e. observation may distort the observed behavior).

Specific data-gathering methods, such as recording EMF (electromagnetic field) readings at haunted locations, have their own criticisms beyond those attributed to the participant-observer approach itself.

Participant observation, as an approach to the paranormal, has gained increased visibility and popularity through reality television programs like Ghost Hunters, and the formation of independent ghost hunting groups that advocate immersive research at alleged paranormal locations. One popular website for ghost hunting enthusiasts lists over 300 of these organizations throughout the United States and the United Kingdom.

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Skeptical scientific investigation Scientific skeptics advocate critical investigation of claims of paranormal phenomena: applying the scientific method to reach a rational, scientific explanation of the phenomena to account for the paranormal claims, taking into account that alleged paranormal abilities and occurrences are sometimes hoaxes or misinterpretations of natural phenomena. A way of summarizing this method is by the application of Occam's razor, which suggests that the simpler solution is usually the correct one.

The Committee for Skeptical Inquiry (CSI), formerly the Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), is an organization that aims to publicize the scientific, skeptical approach. It carries out investigations aimed at understanding paranormal reports in terms of scientific understanding, and publishes its results in the Skeptical Inquirer magazine.

CSI's Richard Wiseman draws attention to possible alternative explanations for perceived paranormal activity in his article, The Haunted Brain. While he recognizes that approximately 15% of people believe they have experienced an encounter with a ghost, he reports that only 1% report seeing a full-fledged ghost while the rest report strange sensory stimuli, such as seeing fleeting shadows or wisps of smoke, or the sensation of hearing footsteps or feeling a presence. Wiseman makes the claim that, rather than experiencing paranormal activity, it is activity within our own brains that creates these strange sensations.

Michael Persinger proposed that ghostly experiences could be explained by stimulating the brain with weak magnetic fields. Swedish psychologist Pehr Granqvist and his team, attempting to replicate Persinger's research, determined that the paranormal sensations experienced by Persinger's subjects were merely the result of suggestion, and that brain stimulation with magnetic fields did not result in ghostly experiences.

Oxford University Justin Barrett has theorized that "agency"—being able to figure out why people do what they do—is so important in everyday life, that it is natural for our brains to work too hard at it, thereby detecting human or ghost-like behavior in everyday meaningless stimuli.

James Randi, an investigator with a background in illusion, felt that the simplest explanation for those claiming paranormal abilities is often trickery, illustrated by demonstrating that the spoon bending abilities of psychic Uri Geller can easily be duplicated by trained stage magicians.

Patrick J. Hurley (2025). 9780840034168, Wadsworth Publishing. ISBN 9780840034168

He was also the founder of the James Randi Educational Foundation and its million dollar challenge that offered a prize of US$1,000,000 to anyone who could demonstrate evidence of any paranormal, supernatural or occult power or event, under test conditions agreed to by both parties. "The Million Dollar Challenge". James Randi Education Foundation. Despite many declarations of supernatural ability, the prize was never claimed.

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Psychology In "anomalistic psychology", paranormal phenomena have naturalistic explanations resulting from Psychology and Physics factors which have sometimes given the impression of paranormal activity to some people, in fact, where there have been none.

(2025). 9780230301504, Palgrave Macmillan. ISBN 9780230301504

The psychologist David Marks wrote that paranormal phenomena can be explained by magical thinking, , subjective validation, coincidence, hidden causes, and fraud. According to studies some people tend to hold paranormal beliefs because they possess psychological traits that make them more likely to misattribute paranormal causation to normal experiences. Research has also discovered that cognitive bias is a factor underlying paranormal belief.

(2025). 9780198568773, Oxford University Press. ISBN 9780198568773

, founder of the Anomalistic Psychology Research Unit.]]

Many studies have found a link between personality and psychopathology variables correlating with paranormal belief. Some studies have also shown that fantasy proneness correlates positively with paranormal belief.

Harvey J. Irwin (2025). 9781902806938, University Of Hertfordshire Press. ISBN 9781902806938

Bainbridge (1978) and Wuthnow (1976) found that the most susceptible people to paranormal belief are those who are poorly educated, Unemployment or have roles that rank low among social values. The alienation of these people due to their status in society is said to encourage them to appeal to paranormal or magical beliefs.

Research has associated paranormal belief with low Cognition, low IQ and a lack of science education. Intelligence and highly educated participants involved in surveys have proven to have less paranormal belief. Tobacyk (1984) and Messer and Griggs (1989) discovered that college students with better grades have less belief in the paranormal.

In a case study (Gow, 2004) involving 167 participants the findings revealed that psychological absorption and dissociation were higher for believers in the paranormal. Another study involving 100 students had revealed a positive correlation between paranormal belief and proneness to dissociation. A study (Williams et al. 2007) discovered that "neuroticism is fundamental to individual differences in paranormal belief, while paranormal belief is independent of extraversion and psychoticism". A correlation has been found between paranormal belief and Irrationality.

In an experiment Wierzbicki (1985) reported a significant correlation between paranormal belief and the number of errors made on a Syllogism task, suggesting that believers in the paranormal have lower Cognition. A relationship between Narcissism and paranormal belief was discovered in a study involving the Australian Sheep-Goat Scale.

De Boer and Bierman wrote:

A psychological study involving 174 members of the Society for Psychical Research completed a delusional ideation questionnaire and a deductive reasoning task. As predicted, the study showed that "individuals who reported a strong belief in the paranormal made more errors and displayed more delusional ideation than skeptical individuals". There was also a reasoning bias which was limited to people who reported a belief in, rather than experience of, paranormal phenomena. The results suggested that reasoning abnormalities may have a causal role in the formation of paranormal belief.

Research has shown that people reporting contact with Grey alien have higher levels of absorption, dissociativity, fantasy proneness and tendency to Hallucination.

Findings have shown in specific cases that paranormal belief acts as a psychodynamic coping function and serves as a mechanism for coping with stress. Survivors from childhood sexual abuse, violent and unsettled home environments have reported to have higher levels of paranormal belief.French, C.C., & Kerman, M.K. (1996). "Childhood trauma, fantasy proneness and belief in the paranormal". Paper presented to the 1996 London Conference of the British Psychological Society, Institute of Education, University of London, 17–18 December 1996. A study of a random sample of 502 adults revealed paranormal experiences were common in the population which were linked to a history of childhood trauma and dissociative symptoms. Research has also suggested that people who perceive themselves as having little control over their lives may develop paranormal beliefs to help provide an enhanced sense of control. The similarities between paranormal events and descriptions of trauma have also been noted.

Gender differences in surveys on paranormal belief have reported women scoring higher than men overall and men having greater belief in UFOs and extraterrestrials. Surveys have also investigated the relationship between Ethnic group and paranormal belief. In a sample of American university students (Tobacyk et al. 1988) it was found that Black people have a higher level of belief in and witchcraft while belief in extraterrestrial life forms was stronger among White people. Otis and Kuo (1984) surveyed Singapore university students and found Han Chinese, Indian people and Ethnic Malays students to differ in their paranormal beliefs, with the Chinese students showing greater skepticism.

According to American surveys analysed by Bader et al. (2011) have the highest belief in the paranormal and while the findings are not uniform the "general trend is for whites to show lesser belief in most paranormal subjects".

Polls show that about fifty percent of the United States population believe in the paranormal. Robert L. Park says a lot of people believe in it because they "want it to be so".

A 2013 study that utilized a biological motion perception task discovered a "relation between illusory pattern perception and supernatural and paranormal beliefs and suggest that paranormal beliefs are strongly related to agency detection biases".

A 2014 study discovered that Schizophrenia patients have more belief in psi than healthy adults.

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Neuroscience Some scientists have investigated possible neurocognitive processes underlying the formation of paranormal beliefs. In a study (Pizzagalli et al. 2000) data demonstrated that "subjects differing in their declared belief in and experience with paranormal phenomena as well as in their schizotypal ideation, as determined by a standardized instrument, displayed differential brain electric activity during resting periods." Another study (Schulter and Papousek, 2008) wrote that paranormal belief can be explained by patterns of functional hemispheric asymmetry that may be related to perturbations during fetal development.

It was also realized that people with higher dopamine levels have the ability to find patterns and meanings where there are none. This is why scientists have connected high dopamine levels with paranormal belief.

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Criticism Some scientists have criticized the Mass media for promoting paranormal claims. In a report by Singer and Benassi in 1981, they wrote that the media may account for much of the near universality of paranormal belief, as the public are constantly exposed to films, newspapers, documentaries and books endorsing paranormal claims while critical coverage is largely absent. According to Paul Kurtz, "In regard to the many talk shows that constantly deal with paranormal topics, the skeptical viewpoint is rarely heard; and when it is permitted to be expressed, it is usually sandbagged by the host or other guests." Kurtz described the popularity of public belief in the paranormal as a "quasi-religious phenomenon", a manifestation of a transcendental temptation, a tendency for people to seek a transcendental reality that cannot be known by using the methods of science. Kurtz compared this to a primitive form of magical thinking.

Paul Kurtz (2025). 9780765800510, Transaction Publishers. . ISBN 9780765800510

Terence Hines has written that on a personal level, paranormal claims could be considered a form of consumer fraud as people are "being induced through false claims to spend their money—often large sums—on paranormal claims that do not deliver what they promise" and uncritical acceptance of paranormal belief systems can be damaging to society.Hines, Terence (2003). p. 38.

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Belief polls While the existence of paranormal phenomena is controversial and debated passionately by both proponents of the paranormal and by skeptics, surveys are useful in determining the beliefs of people in regards to paranormal phenomena. These opinions, while not constituting scientific evidence for or against, may give an indication of the mindset of a certain portion of the population (at least among those who answered the polls). The number of people worldwide who believe in parapsychological powers has been estimated to be 3 to 4 billion.Pigliucci, Massimo; Boudry, Maarten (2013). p. 155.

A survey conducted in 2006 by researchers from Australia's Monash University sought to determine the types of phenomena that people claim to have experienced and the effects these experiences have had on their lives. The study was conducted as an online survey with over 2,000 respondents from around the world participating. The results revealed that around 70% of the respondents believe to have had an unexplained paranormal event that changed their life, mostly in a positive way. About 70% also claimed to have seen, heard, or been touched by an animal or person that they knew was not there; 80% have reported having a precognition, and almost 50% stated they recalled a previous life.

Polls were conducted by Bryan Farha at Oklahoma City University and Gary Steward of the University of Central Oklahoma in 2006. They found fairly consistent results compared to the results of a Gallup poll in 2001."Smart People See Ghosts", Brad Steiger, Fate Magazine, April 2006, p. 52–56; the unusual thing found by Farha and Steward was that belief in the supernatural increased with education level, contrary to many other surveys. However, that aspect of their study is not being used here.

+Percentage of U.S. citizens polled
Psychic, Faith healing	57	26	18	54	19	26	55	17	26
ESP	29	39	33	50	20	27	41	25	32
	41	25	35	42	16	41	37	16	46
Demonic possession	41	28	32	41	16	41	42	13	44
	40	27	34	38	17	44	32	19	48
Telepathy	25	34	42	36	26	35	31	27	42
Extraterrestrials visited Earth in the past	18	34	49	33	27	38	24	24	51
Clairvoyance and Prophecy	24	33	43	32	23	45	26	24	50
Mediumship	16	29	55	28	26	46	21	23	55
Astrology	17	26	57	28	18	52	25	19	55
Witchcraft	27	19	55	26	15	59	21	12	66
Reincarnation	16	28	57	25	20	54	20	20	59

A survey by Jeffrey S. Levin, associate professor at Eastern Virginia Medical School, found that more than two thirds of the United States population reported having at least one mystical experience. USA Today, 12 January 1994

A 1996 Gallup poll estimated that 71% of the people in the U.S. believed that the government was covering up information about . A 2002 Roper poll conducted for the Syfy reported that 56% thought UFOs were real craft and 48% that aliens had visited the Earth.

A 2001 National Science Foundation survey found that 9% of people polled thought astrology was very scientific, and 31% thought it was somewhat scientific. About 32% of Americans surveyed stated that some numbers were lucky, while 46% of agreed with that claim. About 60% of all people polled believed in some form of Extra-sensory perception and 30% thought that "some of the unidentified flying objects that have been reported are really space vehicles from other civilizations."

In 2017 the Chapman University Survey of American Fears asked about seven paranormal beliefs and found that "the most common belief is that ancient advanced civilizations such as Atlantis once existed (55%). Next was that places can be haunted by spirits (52%), aliens have visited Earth in our ancient past (35%), aliens have come to Earth in modern times (26%), some people can move objects with their minds (25%), fortune tellers and psychics can survey the future (19%), and Bigfoot is a real creature. Only one-fourth of respondents didn't hold at least one of these beliefs."

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Paranormal challenges In 1922, Scientific American offered two US$2,500 offers: (1) for the first authentic spirit photograph made under test conditions, and (2) for the first psychic to produce a "visible psychic manifestation". Harry Houdini was a member of the investigating committee. The first mediumship to be tested was George Valiantine, who claimed that in his presence spirits would speak through a trumpet that floated around a darkened room. For the test, Valiantine was placed in a room, the lights were extinguished, but unbeknownst to him his chair had been rigged to light a signal in an adjoining room if he ever left his seat. Because the light signals were tripped during his performance, Valiantine did not collect the award. The last to be examined by Scientific American was Mina Crandon in 1924.

Since then, many individuals and groups have offered similar monetary awards for proof of the paranormal in an observed setting. These prizes have a combined value of over $2.4 million.

The James Randi Educational Foundation offered a prize of a million dollars to a person who could prove that they had supernatural or paranormal abilities under appropriate test conditions. Several other skeptic groups also offer a monied prize for proof of the paranormal, including the largest group of paranormal investigators, the Independent Investigations Group, which has chapters in Hollywood; Atlanta; Denver; Washington, D.C.; Alberta, B.C.; and San Francisco. The IIG offers a $100,000 prize and a $5,000 finders fee if a claimant can prove a paranormal claim under 2 scientifically controlled tests. Founded in 2000 no claimant has passed the first (and lower odds) of the test.

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See also

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Paranormal

• Folie à deux
• Ghost Stations
• Mysticism
• Out-of-body experience
• Psionics
• List of paranormal magazines
• List of reported UFO sightings
• Yūrei
• Paranormal investigators
• Supernatural

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By location

• Bangladesh
• Canada
• China
• Colombia
• France
• India
• Mexico
• Philippines
• Romania
• United Kingdom
• Scotland
• United States
• California
• San Francisco Bay Area
• Oregon
• Pennsylvania
• Plymouth, Massachusetts
• Washington, DC

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Authors

• Arthur C. Clarke
• Hilary Evans
• Bruce Barrymore Halpenny
• Bernard Heuvelmans
• John Keel
• Robert Ripley
• Carl Sagan
• Ivan Sanderson
• Rupert Sheldrake
• Brad Steiger

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Skepticism

• Center for Inquiry Investigations Group
• Critical thinking
• Prizes for paranormal proof
• Schizotypy

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Notes

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Further reading

• French, Chris. The Science of Weird Shit: Why Our Minds Conjure the Paranormal. United States, MIT Press, 2024.
• (2025). 9781479819652, New York University Press. ISBN 9781479819652
• (2025). 9781841698816, Psychology Press. ISBN 9781841698816
• Daniel Cohen (1989). 9780880294515, Hippocrene Books. ISBN 9780880294515
• Terence Hines (2025). 9781573929790, Prometheus Books. ISBN 9781573929790
• (2025). 9781841699332, Psychology Press. ISBN 9781841699332
• Harvey J. Irwin (2025). 9781902806938, University of Hertfordshire Press. ISBN 9781902806938
• Tony Jinks (2025). 9780786465446, Mcfarland. ISBN 9780786465446
• Gordon Stein (1996). 9781573920216, Prometheus Books. ISBN 9781573920216

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External links

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