Attempts to contact the dead date back to early human history, with mediumship gaining in popularity during the 19th century. Investigations during this period revealed widespread fraud—with some practitioners employing techniques used by stage magicians—and the practice started to lose credibility. The practice still continues into the 21st century, with high-profile fraud uncovered as recently as the 2000s.
Scientific researchers have attempted to ascertain the validity of claims of mediumship. An experiment undertaken by the British Psychological Society led to the conclusion that the test subjects demonstrated no mediumistic ability.
Several different variants of mediumship exist; arguably the best-known forms involve a spirit allegedly taking control of a medium's voice and using it to relay a message, or where the medium simply "hears" the message and passes it on. Other forms involve materializations of the spirit or the presence of a voice, and telekinetic activity.
- 1 Concept
- 2 History
- 3 Terminology
- 4 Psychic senses
- 5 Explanations
- 6 Fraud
- 7 See also
- 8 References
- 9 Further reading
- 10 External links
In Spiritism and Spiritualism the medium has the role of an intermediary between the world of the living and the world of spirit. Mediums claim that they can listen to and relay messages from spirits, or that they can allow a spirit to control their body and speak through it directly or by using automatic writing or drawing.
Spiritualists classify types of mediumship into two main categories: "mental" and "physical":
- Mental mediums allegedly "tune in" to the spirit world by listening, sensing, or seeing spirits or symbols.
- Physical mediums are believed to produce materialization of spirits, apports of objects, and other effects such as knocking, rapping, bell-ringing, etc. by using "ectoplasm" created from the cells of their bodies and those of seance attendees.
During seances, mediums are said to go into trances, varying from light to deep, that permit spirits to control their minds.
Channeling can be seen as the modern form of the old mediumship, where the "channel" (or channeller) allegedly receives messages from "teaching-spirit", an "Ascended Master", from God, or from an angelic entity, but essentially through the filter of his own waking consciousness (or "Higher Self").
Attempts to communicate with the dead and other living human beings, aka spirits, have been documented back to early human history. The story of the Witch of Endor (In the most recent edition of the NIV witch is rendered medium in the passage) tells of one who raised the spirit of the deceased prophet Samuel to allow the Hebrew king Saul to question his former mentor about an upcoming battle, as related in the First book of Samuel in the Jewish Tanakh (the Old Testament).
Mediumship became quite popular in the 19th-century United States and the United Kingdom after the rise of Spiritualism as a religious movement. Modern Spiritualism is said to date from practices and lectures of the Fox sisters in New York State in 1848. The trance mediums Paschal Beverly Randolph and Emma Hardinge Britten were among the most celebrated lecturers and authors on the subject in the mid-19th century. Allan Kardec coined the term Spiritism around 1860. Kardec claimed that conversations with spirits by selected mediums were the basis of his The Spirits' Book and later, his five-book collection, Spiritist Codification.
After the exposure of the fraudulent use of stage magic tricks by physical mediums such as the Davenport Brothers and the Bangs Sisters, mediumship fell into disrepute. The practice continued among people who believed that the dead can be contacted and tried to do so. From the 1930s through the 1990s, as psychical mediumship became less practiced in Spiritualist churches, the technique of "channelling" gained in popularity. Books by channellers who claimed to relate the wisdom of non-corporeal and non-terrestrial teacher-spirits became best-sellers amongst believers.
In 1958, the English-born Spiritualist C. Dorreen Phillips wrote of her experiences with a medium at Camp Chesterfield, Indiana: "In Rev. James Laughton's séances there are many Indians. They are very noisy and appear to have great power. [...] The little guides, or doorkeepers, are usually Indian boys and girls [who act] as messengers who help to locate the spirit friends who wish to speak with you."
A spirit who uses a medium to manipulate psychic "energy" or "energy systems."
Demonstrations of mediumship
In old-line Spiritualism, a portion of the services, generally toward the end, is given over to demonstrations of mediumship through contact with the spirits of the dead. A typical example of this way of describing a mediumistic church service is found in the 1958 autobiography of C. Dorreen Phillips. She writes of the worship services at the Spiritualist Camp Chesterfield in Chesterfield, Indiana: "Services are held each afternoon, consisting of hymns, a lecture on philosophy, and demonstrations of mediumship."
Today "demonstration of mediumship" is part of the church service at all churches affiliated with the National Spiritualist Association of Churches (NSAC). Demonstration links to NSAC's Declaration of Principal #9. "We affirm that the precepts of Prophecy and Healing are Divine attributes proven through Mediumship."
"Mental mediumship" is communication of spirits with a medium by telepathy. The medium mentally "hears" (clairaudience), "sees" (clairvoyance), and/or feels (clairsentience) messages from spirits. Directly or with the help of a spirit guide, the medium passes the information on to the message's recipient(s). When a medium is doing a "reading" for a particular person, that person is known as the "sitter."
"Trance mediumship" is often seen as a form of mental mediumship.
Most trance mediums remain conscious during a communication period, wherein a spirit uses the medium's mind to communicate. The spirit or spirits using the medium's mind influences the mind with the thoughts being conveyed. The medium allows the ego to step aside for the message to be delivered. At the same time, one has awareness of the thoughts coming through and may even influence the message with one's own bias. Such a trance is not to be confused with sleepwalking, as the patterns are entirely different. Castillo (1995) states,
Trance phenomena result from the behavior of intense focusing of attention, which is the key psychological mechanism of trance induction. Adaptive responses, including institutionalized forms of trance, are 'tuned' into neural networks in the brain.
In the 1860s and 1870s, trance mediums were very popular. Spiritualism generally attracted female adherents, many who had strong interests in social justice. Many trance mediums delivered passionate speeches on abolitionism, temperance, and women's suffrage. Scholars have described Leonora Piper as one of the most famous trance mediums in the history of Spiritualism.
In the typical deep trance, the medium may not have clear recall of all the messages conveyed while in an altered state; such people generally work with an assistant. That person selectively wrote down or otherwise recorded the medium's words. Rarely did the assistant record the responding words of the sitter and other attendants. An example of this kind of relationship can be found in the early 20th century collaboration between the trance medium Mrs. Cecil M. Cook of the William T. Stead Memorial Center in Chicago (a religious body incorporated under the statutes of the State of Illinois) and the journalist Lloyd Kenyon Jones. The latter was a non-medium Spiritualist who transcribed Cook's messages in shorthand. He edited them for publication in book and pamphlet form.
Physical mediumship is defined as manipulation of energies and energy systems by spirits. This type of mediumship is claimed to involve perceptible manifestations, such as loud raps and noises, voices, materialized objects, apports, materialized spirit bodies, or body parts such as hands, legs and feet. The medium is used as a source of power for such spirit manifestations. By some accounts, this was achieved by using the energy or ectoplasm released by a medium, see Spirit photography. The last physical medium to be tested by a committee from Scientific American was Mina Crandon in 1924.
Most physical mediumship is presented in a darkened or dimly lit room. Most physical mediums make use of a traditional array of tools and appurtenances, including spirit trumpets, spirit cabinets, and levitation tables.
Direct voice communication is the claim that spirits speak independently of the medium, who facilitates the phenomenon rather than produces it. The role of the medium is to make the connection between the physical and spirit worlds. Trumpets are often utilised to amplify the signal, and directed voice mediums are sometimes known as "trumpet mediums". This form of mediumship also permits the medium to participate in the discourse during séances, since the medium's voice is not required by the spirit to communicate. Leslie Flint was one of the best known exponents of this form of mediumship.
In the later half of the 20th century, Western mediumship developed in two different ways. One type involves psychics or sensitives who speak to spirits and then relay what they hear to their clients.
The other incarnation of non-physical mediumship is a form of channeling in which the channeler goes into a trance, or "leaves their body". He or she allows the entity to borrow his/her body, who then talks through them. When in a trance the medium seems to come under the control of another personality, purportedly the spirit of a departed soul, and a genuine medium undoubtedly believes the 'control' to be a spirit entity. While in the old deep trance state the medium often enters a cataleptic state marked by extreme rigidity, this seems not the case for most of modern channelers. Some of them open the eyes when channeling, smile and utilize any sort of glances and facial expressions. They can also walk and behave normally. The rhythm and the intonation of the voice may also change completely. A widely known channeler of this variety is J. Z. Knight, who channels the spirit of Ramtha, a 30 thousand-year-old man. Others claim to channel spirits from "future dimensions", ascended masters, or, in the case of the trance mediums of the Brahma Kumaris, God. Other notable channels are Jane Roberts for Seth, Esther Hicks for Abraham, and Carla L. Rueckert for Ra.
In spiritualism, psychic senses used by mental mediums are sometimes defined differently from in other paranormal fields. A medium is said to have psychic abilities but not all psychics function as mediums.  The term clairvoyance, for instance, may be used by Spiritualists to include seeing spirits and visions instilled by spirits. The Parapsychological Association defines "clairvoyance" as information derived directly from an external physical source.
- Clairvoyance or "clear seeing", is the ability to see anything that is not physically present, such as objects, animals or people. This sight occurs "in the mind's eye". Some mediums say that this is their normal vision state. Others say that they must train their minds with such practices as meditation in order to achieve this ability, and that assistance from spiritual helpers is often necessary. Some clairvoyant mediums can see a spirit as though the spirit has a physical body. They see the bodily form as if it were physically present. Other mediums see the spirit in their mind's eye, or it appears as a movie or a television programme or a still picture like a photograph in their mind.
- Clairaudience or "clear hearing", is usually defined as the ability to hear the voices or thoughts of spirits. Some mediums hear as though they are listening to a person talking to them on the outside of their head, as though the Spirit is next to or near to the medium, and other mediums hear the voices in their minds as a verbal thought.
- Clairsentience or "clear sensing", is the ability to have an impression of what a spirit wants to communicate, or to feel sensations instilled by a spirit.
- Clairsentinence or "clear feeling" is a condition in which the medium takes on the ailments of a spirit, feeling the same physical problem which the spirit person had before death.
- Clairalience or "clear smelling" is the ability to smell a spirit. For example, a medium may smell the pipe tobacco of a person who smoked during life.
- Clairgustance or "clear tasting" is the ability to receive taste impressions from a spirit.
- Claircognizance or "clear knowing", is the ability to know something without receiving it through normal or psychic senses. It is a feeling of "just knowing". Often, a medium will claim to have the feeling that a message or situation is "right" or "wrong."
Spiritualists believe that phenomena produced by mediums (both mental and physical mediumship) are the result of external spirit agencies. The psychical researcher Thomson Jay Hudson in The Law of Psychic Phenomena (1892) and Théodore Flournoy in his book Spiritism and Psychology (1911) wrote that all kinds of mediumship could be explained by suggestion and telepathy from the medium and that there was no evidence for the spirit hypothesis. The idea of mediumship being explained by telepathy was later merged into the "super-ESP" hypothesis of mediumship which is currently advocated by some parapsychologists.
In their book How to Think About Weird Things: Critical Thinking for a New Age, authors Theodore Schick and Lewis Vaughn have noted that the spiritualist and ESP hypothesis of mediumship "has yielded no novel predictions, assumes unknown entities or forces, and conflicts with available scientific evidence."
Scientists who study anomalistic psychology consider mediumship to be the result of fraud and psychological factors. Research from psychology for over a hundred years has revealed that where there is not fraud, mediumship and Spiritualist practices can be explained by hypnotism, magical thinking and suggestion. Trance mediumship which is claimed by the Spiritualists to be caused by discarnate spirits speaking through the medium have been proven in cases to be alternate personalities from the medium's subconscious mind.
Magicians such as Joseph Rinn have staged fake séances in which the sitters have claimed to have observed genuine supernatural phenomena. Albert Moll studied the psychology of séance sitters. According to (Wolffram, 2012) "[Moll] argued that the hypnotic atmosphere of the darkened séance room and the suggestive effect of the experimenters’ social and scientific prestige could be used to explain why seemingly rational people vouchsafed occult phenomena." The psychologists Leonard Zusne and Warren Jones in their book Anomalistic Psychology: A Study of Magical Thinking (1989) wrote that spirits controls are the "products of the medium's own psychological dynamics."
The medium may obtain information about their sitters by secretly eavesdropping on sitter's conversations or searching telephone directories, the internet and newspapers before the sittings. Mediums are known for employing a technique called cold reading and obtain information from the sitter's behavior, clothing, posture, and jewellery.
The psychologist Richard Wiseman has written:
Cold reading also explains why psychics have consistently failed scientific tests of their powers. By isolating them from their clients, psychics are unable to pick up information from the way those clients dress or behave. By presenting all of the volunteers involved in the test with all of the readings, they are prevented from attributing meaning to their own reading, and therefore can’t identify it from readings made for others. As a result, the type of highly successful hit rate that psychics enjoy on a daily basis comes crashing down and the truth emerges – their success depends on a fascinating application of psychology and not the existence of paranormal abilities.
In a series of fake séance experiments (Wiseman et al. 2003) paranormal believers and disbelievers were suggested by an actor that a table was levitating when, in fact, it remained stationary. After the seance, approximately one third of the participants incorrectly reported that the table had moved. The results showed a greater percentage of believers reporting that the table had moved. In another experiment the believers had also reported that a handbell had moved when it had remained stationary and expressed their belief that the fake séances contained genuine paranormal phenomena. The experiments strongly supported the notion that in the séance room, believers are more suggestible than disbelievers for suggestions that are consistent with their belief in paranormal phenomena.
There have been many instances of fraud and trickery in mediumship practices from its earliest beginnings to contemporary times. Séances take place in darkness so the poor lighting conditions can become an easy opportunity for fraud. Physical mediumship that has been investigated by scientists has been discovered to be the result of deception and trickery. Ectoplasm a supposed paranormal substance was revealed to be made from cheesecloth, butter, muslin and cloth. Mediums would also stick cut-out faces from magazines and newspapers onto cloth or on other props and use plastic dolls in their séances to pretend to their audiences spirits were contacting them. Lewis Spence in his book An Encyclopaedia of Occultism (1960) wrote:
A very large part is played by fraud in spiritualistic practices, both in the physical and psychical, or automatic, phenomena, but especially in the former. The frequency with which mediums have been convicted of fraud has, indeed, induced many people to abandon the study of psychical research, judging the whole bulk of the phenomena to be fraudulently produced.
In Britain, the Society for Psychical Research has investigated mediumship phenomena. Critical SPR investigations into purported mediums and the exposure of fake mediums has led to a number of resignations by Spiritualist members. On the subject of fraud in mediumship Paul Kurtz wrote:
No doubt a great importance in the paranormal field is the problem of fraud. The field of psychic research and spiritualism has been so notoriously full of charlatans, such as the Fox sisters and Eusapia Palladino–individuals who claim to have special power and gifts but who are actually conjurers who have hoodwinked scientists and the public as well–that we have to be especially cautious about claims made on their behalf.
Magicians have a long history of exposing the fraudulent methods of mediumship. Early debunkers included Chung Ling Soo, Henry Evans and Julien Proskauer. Later magicians to reveal fraud were Joseph Dunninger, Harry Houdini and Joseph Rinn.
Many 19th century mediums were discovered to be engaged in fraud. While advocates of mediumship claim that their experiences are genuine, the Encyclopædia Britannica article on spiritualism notes in reference to a case in the 19th century that "...one by one, the Spiritualist mediums were discovered to be engaged in fraud, sometimes employing the techniques of stage magicians in their attempts to convince people of their clairvoyant powers." The article also notes that "the exposure of widespread fraud within the spiritualist movement severely damaged its reputation and pushed it to the fringes of society in the United States."
At a séance in the house of the solicitor John Snaith Rymer in Ealing on July 1855, a sitter Frederick Merrifield observed that a "spirit-hand" was a false limb attached on the end of the medium Daniel Dunglas Home's arm. Merrifield also claimed to have observed Home use his foot in the séance room.
The poet Robert Browning and his wife Elizabeth attended a séance on 23, July 1855 in Ealing with the Rymers. During the séance a spirit face materialized which Home claimed was the son of Browning who had died in infancy. Browning seized the "materialization" and discovered it to be the bare foot of Home. To make the deception worse, Browning had never lost a son in infancy. Browning's son Robert in a letter to The Times, December 5, 1902 referred to the incident "Home was detected in a vulgar fraud." The researchers Joseph McCabe and Trevor H. Hall exposed the "levitation" of Home as nothing more than him moving across a connecting ledge between two iron balconies.
The psychologist and psychical researcher Stanley LeFevre Krebs had exposed the Bangs Sisters as frauds. During a séance he employed a hidden mirror and caught them tampering with a letter in an envelope and writing a reply in it under the table which they would pretend a spirit had written. The British materialization medium Rosina Mary Showers was caught in many fraudulent séances throughout her career. In 1874 during a séance with Edward William Cox a sitter looked into the cabinet and seized the spirit, the headdress fell off and was revealed to be Showers.
In a series of experiments in London at the house of William Crookes in February 1875, the medium Anna Eva Fay managed to fool Crookes into believing she had genuine psychic powers. Fay later confessed to her fraud and revealed the tricks she had used. Frank Herne a British medium who formed a partnership with the medium Charles Williams was repeatedly exposed in fraudulent materialization séances. In 1875 he was caught pretending to be a spirit during a séance in Liverpool and was found "clothed in about two yards of stiffened muslin, wound round his head and hanging down as far as his thigh." Florence Cook had been "trained in the arts of the séance" by Herne and was repeatedly exposed as a fraudulent medium.
The medium Henry Slade was caught in fraud many times throughout his career. In a séance in 1876 in London Ray Lankester and Bryan Donkin snatched his slate before the "spirit" message was supposed to be written, and found the writing already there. Slade also played an accordion with one hand under the table and claimed spirits would play it. The magician Chung Ling Soo revealed how Slade had performed the trick.
The British medium Francis Ward Monck was investigated by psychical researchers and discovered to be a fraud. On November 3, 1876 during the séance a sitter demanded that Monck be searched. Monck ran from the room, locked himself in another room and escaped out of a window. A pair of stuffed gloves was found in his room, as well as cheesecloth, reaching rods and other fraudulent devices in his luggage. After a trial Monck was convicted for his fraudulent mediumship and was sentenced to three months in prison.
In 1876, William Eglinton was exposed as a fraud when the psychical researcher Thomas Colley seized a "spirit" materialization in his séance and cut off a portion of its cloak. It was discovered that the cut piece matched a cloth found in Eglinton's suitcase. Colley also pulled the beard off the materialization and it was revealed to be a fake, the same as another one found in the suitcase of Eglinton. In 1880 in a séance a spirit named "Yohlande" materialized, a sitter grabbed it and was revealed to be the medium Mme. d'Esperance herself.
In September 1878 the British medium Charles Williams and his fellow-medium at the time, A. Rita, were detected in trickery at Amsterdam. During the séance a materialized spirit was seized and found to be Rita and a bottle of phosphorus oil, muslin and a false beard were found amongst the two mediums. In 1882 C. E. Wood was exposed in a séance in Peterborough. Her Indian spirit control "Pocka" was found to be the medium on her knees, covered in muslin.
In 1880 the American stage mentalist Washington Irving Bishop published a book revealing how mediums would use secret codes as the trick for their clairvoyant readings. The Seybert Commission was a group of faculty at the University of Pennsylvania who in 1884-1887 exposed fraudulent mediums such as Pierre L. O. A. Keeler and Henry Slade. The Fox sisters confessed to fraud in 1888. Margaret Fox revealed that she and her sister had produced the "spirit" rappings by cracking their toe joints.
In 1891 at a public séance with twenty sitters the medium Cecil Husk was caught leaning over a table pretending to be a spirit by covering his face with phosphor material. The magician Will Goldston also exposed the fraud mediumship of Husk. In a séance Goldston attended a pale face materialization appeared in the room. Goldston wrote "I saw at once that it was a gauze mask, and that the moustache attached to it was loose at one side through lack of gum. I pulled at the mask. It came away, revealing the face of Husk." The British materialization medium Annie Fairlamb Mellon was exposed as a fraud on October 12, 1894. During the séance a sitter seized the materialized spirit, and found it to be the Mellon on her knees with white muslin on her head and shoulders.
The magician Samri Baldwin exposed the tricks of the Davenport brothers in his book The Secrets of Mahatma Land Explained (1895). The medium Swami Laura Horos was convicted of fraud several times and was tried for rape and fraud in London in 1901. She was described by the magician Harry Houdini as "one of the most extraordinary fake mediums and mystery swindlers the world has ever known".
In the late 19th century the fraudulent methods of spirit photographers such as David Duguid and Edward Wyllie were revealed by psychical researchers. Hereward Carrington documented various methods (with diagrams) how the medium would manipulate the plates before, during, and after the séance to produce spirit forms. The ectoplasm materializations of the French medium Eva Carrière were exposed as fraudulent. The fake ectoplasm of Carrière was made of cut-out paper faces from newspapers and magazines on which fold marks could sometimes be seen from the photographs. Cut out faces that she used included Woodrow Wilson, King Ferdinand of Bulgaria, French president Raymond Poincaré and the actress Mona Delza.
The séance trick of the Eddy Brothers was revealed by the magician Chung Ling Soo in 1898. The brothers utilized a fake hand made of lead, and with their hands free from control would play musical instruments and move objects in the séance room. The physiologist Ivor Lloyd Tuckett examined a case of spirit photography that W. T. Stead had claimed was genuine. Stead visited a photographer who had produced a photograph of him with deceased soldier known as "Piet Botha". Stead claimed that the photographer could not have come across any information about Piet Botha, however, Tuckett discovered that an article in 1899 had been published on Pietrus Botha in a weekly magazine with a portrait and personal details.
The trance medium Leonora Piper was investigated by psychical researchers and psychologists in the late 19th and early 20th century. In an experiment to test if Piper's "spirit" controls were purely fictitious the psychologist G. Stanley Hall invented a niece called Bessie Beals and asked Piper's 'control' to get in touch with it. Bessie appeared, answered questions and accepted Dr. Hall as her uncle. The psychologist Joseph Jastrow wrote that Piper pretended to be controlled by spirits and fell into simple and logical traps from her comments. Science writer Martin Gardner concluded Piper was a cold reader that would "fish" for information from her séance sitters. The physiologist Ivor Lloyd Tuckett who examined Piper's mediumship in detail wrote it could be explained by "muscle-reading, fishing, guessing, hints obtained in the sitting, knowledge surreptitiously obtained, knowledge acquired in the interval between sittings and lastly, facts already within Mrs. Piper's knowledge."
In March 1902 in Berlin, police officers interrupted a séance of the German apport medium Frau Anna Rothe. Her hands were grabbed and she was wrestled to the ground. A female police assistant physically examined Rothe and discovered 157 flowers as well as oranges and lemons hidden in her petticoat. She was arrested and charged with fraud. Another apport medium Hilda Lewis known as the "flower medium" confessed to fraud.
The psychical researchers W. W. Baggally and Everard Feilding exposed the British materialization medium Christopher Chambers as a fraud in 1905. A false moustache was discovered in the séance room which he used to fabricate the spirit materializations. The British medium Charles Eldred was exposed as a fraud in 1906. Eldred would sit in a chair in a curtained off area in the room known as a "séance cabinet". Various spirit figures would emerge from the cabinet and move around the séance room, however, it was discovered that the chair had a secret compartment that contained beards, cloths, masks, and wigs that Eldred would dress up in to fake the spirits.
The spirit photographer William Hope tricked William Crookes with a fake spirit photograph of his wife in 1906. Oliver Lodge revealed there had been obvious signs of double exposure, the picture of Lady Crookes had been copied from a wedding anniversary photograph, however, Crookes was a convinced spiritualist and claimed it was genuine evidence for spirit photography.
In 1907, Hereward Carrington exposed the tricks of fraudulent mediums such as those used in slate-writing, table-turning, trumpet mediumship, materializations, sealed-letter reading and spirit photography. Between 1908-1914 the Italian medium Francesco Carancini was investigated by psychical researchers and they discovered that he used phosphorus matches to produce "spirit lights" and with a freed hand would move objects in the séance room.
In 1908 at a hotel in Naples, the psychical researcher Everard Feilding attended a series of séances with Eusapia Palladino. In a report Feilding claimed genuine supernatural activity had occurred in the séances, this report became known as the Feilding report. In 1910, Feilding returned to Naples, but this time accompanied with the magician William S. Marriott. Unlike the 1908 sittings, Feilding and Marriott detected her cheating, just as she had done in America. Her deceptions were obvious. Palladino evaded control and was caught moving objects with her foot, shaking the curtain with her hands, moving the cabinet table with her elbow and touching the séance sitters. Milbourne Christopher wrote regarding the exposure "when one knows how a feat can be done and what to look for, only the most skillful performer can maintain the illusion in the face of such informed scrutiny."
In 1910 at a séance in Grenoble, France the apport medium Charles Bailey produced two live birds in the séance room. Bailey was unaware that the dealer he had bought the birds from was present in the séance and he was exposed as a fraud. The psychical researcher Eric Dingwall observed the medium Bert Reese in New York and claimed to have discovered his billet reading tricks. The most detailed account at exposing his tricks (with diagrams) was by the magician Theodore Annemann.
The Polish medium Stanisława Tomczyk's levitation of a glass beaker was exposed and replicated in 1910 by the magician William Marriott by means of a hidden thread. The Italian medium Lucia Sordi was exposed in 1911, she was bound to a chair by psychical researchers but would free herself during her séances. The tricks of another Italian medium Linda Gazzera were revealed in the same year, she would release her hands and feet from control in her séances and use them. Gazzera would not permit anyone to search her before a séance sitting, as she concealed muslin and other objects in her hair.
In 1917, Edward Clodd analyzed the mediumship of the trance medium Gladys Osborne Leonard and came to the conclusion that Leonard had known her séance sitters before she had held the séances, and could have easily obtained such information by natural means. The British psychiatrist Charles Arthur Mercier wrote in his book Spiritualism and Sir Oliver Lodge (1917) that Oliver Lodge had been duped into believing mediumship by trickery and his spiritualist views were based on assumptions and not scientific evidence.
In 1918, Joseph Jastrow wrote about the tricks of Eusapia Palladino who was an expert at freeing her hands and feet from the control in the séance room. In the séance room Palladino would move curtains from a distance by releasing a jet of air from a rubber bulb that she had in her hand. According to the psychical researcher Harry Price "Her tricks were usually childish: long hairs attached to small objects in order to produce 'telekinetic movements'; the gradual substitution of one hand for two when being controlled by sitters; the production of 'phenomena' with a foot which had been surreptitiously removed from its shoe and so on."
In the 1920s the British medium Charles Albert Beare duped the Spiritualist organization the Temple of Light into believing he had genuine mediumship powers. In 1931 Beare published a confession in the newspaper Daily Express. In the confession he stated "I have deceived hundreds of people…. I have been guilty of fraud and deception in spiritualistic practices by pretending that I was controlled by a spirit guide…. I am frankly and whole-heartedly sorry that I have allowed myself to deceive people." Due to the exposure of William Hope and other fraudulent spiritualists, Arthur Conan Doyle in the 1920s led a mass resignation of eighty-four members of the Society for Psychical Research, as they believed the Society was opposed to spiritualism.
Between 8 November and 31 December 1920 Gustav Geley of the Institute Metapsychique International attended fourteen séances with the medium Franek Kluski in Paris. A bowl of hot paraffin was placed in the room and according to Kluski spirits dipped their limbs into the paraffin and then into a bath of water to materialize. Three other series of séances were held in Warsaw in Kluski's own apartment, these took place over a period of three years. Kluski was not searched in any of the séances. Photographs of the molds were obtained during the four series of experiments and were published by Geley in 1924. Harry Houdini replicated the Kluski materialization moulds by using his hands and a bowl of hot paraffin.
The British direct-voice medium Frederick Tansley Munnings was exposed as a fraud when one of his séance sitters turned the lights on which revealed him to be holding a trumpet by means of a telescopic extension piece and using an angle piece to change the auditory effect of his voice. Richard Hodgson held six sittings with the medium Rosina Thompson and came to the conclusion she was a fraud as he discovered Thompson had access to documents and information about her séance sitters.
On 4 February 1922, Harry Price with James Seymour, Eric Dingwall and William Marriott had proven the spirit photographer William Hope was a fraud during tests at the British College of Psychic Science. Price wrote in his SPR report "William Hope has been found guilty of deliberately substituting his own plates for those of a sitter... It implies that the medium brings to the sitting a duplicate slide and faked plates for fraudulent purposes." The medium Kathleen Goligher was investigated by the physicist Edmund Fournier d'Albe. On July 22, 1921 in a séance he observed Goligher holding the table up with her foot. He also discovered that her ectoplasm was made of muslin. During a séance d'Albe observed white muslin between Goligher's feet.
The Danish medium Einer Nielsen was investigated by a committee from the Kristiania University in Norway, 1922 and discovered in a séance that his ectoplasm was fake. In 1923 the Polish medium Jan Guzyk was exposed as a fraud in a series of séances in Sorbonne in Paris. Guzyk would use his elbows and legs to move objects around the room and touch the sitters. According to Max Dessoir the trick of Guzyk was to use his "foot for psychic touches and sounds".
The psychical researchers Eric Dingwall and Harry Price re-published an anonymous work written by a former medium entitled Revelations of a Spirit Medium (1922) which exposed the tricks of mediumship and the fraudulent methods of producing "spirit hands". Originally all the copies of the book were bought up by spiritualists and deliberately destroyed. In 1923, the magician Carlos María de Heredia revealed how fake spirit hands could be made by using a rubber glove, paraffin and a jar of cold water. In 1922, Harry Price, James Seymour, Eric Dingwall and William Marriott exposed the fraud of the spirit photographer William Hope. Price wrote in his report "William Hope has been found guilty of deliberately substituting his own plates for those of a sitter... It implies that the medium brings to the sitting a duplicate slide and faked plates for fraudulent purposes."
The Austrian medium Rudi Schneider was investigated in 1924 by the physicists Stefan Meyer and Karl Przibram. They caught Rudi freeing his arm in a series of séances. Rudi claimed he could levitate objects but according Harry Price a photograph taken on April 28, 1932 showed that Rudi had managed to free his arm to move a handkerchief from the table. According to Warren Jay Vinton, Schneider was an expert at freeing himself from control in the séance room. Oliver Gatty and Theodore Besterman who examined the mediumship of Schneider concluded there is "no good evidence that Rudi Schneider possesses supernormal powers."
The spiritualists Arthur Conan Doyle and W. T. Stead were duped into believing Julius and Agnes Zancig had genuine psychic powers. Both Doyle and Stead wrote that the Zancigs performed telepathy. In 1924 Julius and Agnes Zancig confessed that that their mind reading act was a trick and published the secret code and all the details of the trick method they had used under the title of Our Secrets!! in a London Newspaper.
In 1925, Samuel Soal claimed to have taken part in a series of séances with the medium Blanche Cooper who contacted the spirit of a soldier Gordon Davis and revealed the house that he had lived in. Researchers later discovered fraud as the séances had taken place in 1922, not 1925. The magician and paranormal investigator Bob Couttie revealed that Davis was alive, Soal lived close to him and had altered the records of the sittings after checking out the house. Soal's co-workers knew that he had fiddled the results but were kept quiet with threats of libel suits.
Mina Crandon claimed to materialize a "spirit hand", but when examined by biologists the hand was discovered to be made from a piece of carved animal liver. The German apport medium Heinrich Melzer was discovered to be a fraud in 1926. In a séance psychical researchers found that Melzer had small stones attached to the back of his ears by flesh coloured tape. Psychical researchers who investigated the mediumship of Maria Silbert revealed that she used her feet and toes to move objects in the séance room.
In 1930 the Polish medium Stanislawa P. was tested at the Institut Metapsychique in Paris. Eugene Osty suspected in the séance that Stanislawa had freed her hand from control. Secret flashlight photographs that were taken revealed that her hand was free and she had moved objects on the séance table. It was claimed by spiritualists that during a series of séances in 1930 the medium Eileen J. Garrett channeled secret information from the spirit of the Lieutenant Herbert Carmichael Irwin who had died in the R101 crash a few days before the séance. Researcher Melvin Harris who studied the case wrote that the information described in Garrett's séances were "either commonplace, easily absorbed bits and pieces, or plain gobblede- gook. The so-called secret information just doesn't exist."
In the 1930s Harry Price (director of the National Laboratory of Psychical Research) had investigated the medium Helen Duncan and had her perform a number of test séances. She was suspected of swallowing cheesecloth which was then regurgitated as "ectoplasm". Price had proven through analysis of a sample of ectoplasm produced by Duncan, that it was made of cheesecloth. Helen Duncan would also use a doll made of a painted papier-mâché mask draped in an old sheet which she pretended to her sitters was a spirit. The photographs taken by Thomas Glendenning Hamilton in the 1930s of ectoplasm reveal the substance to be made of tissue paper and magazine cut-outs of people. The famous photograph taken by Hamilton of the medium Mary Ann Marshall depicts tissue paper with a cut out of Arthur Conan Doyle's head from a newspaper. Skeptics have suspected that Hamilton may have been behind the hoax.
Psychologists and researchers who studied Pearl Curran's automatic writings in the 1930s came to the conclusion Patience Worth was a fictitious creation of Curran. In 1931 George Valiantine was exposed as a fraud in the séance room as it was discovered that he produced fraudulent "spirit" fingerprints in wax. The "spirit" thumbprint that Valiantine claimed belonged to Arthur Conan Doyle was revealed to be the print of his big toe on his right foot. It was also revealed that Valiantine made some of the prints with his elbow.
The medium Frank Decker was exposed as a fraud in 1932. A magician and séance sitter who called himself M. Taylor presented a mail bag and Decker agreed to lock himself inside it. During the séance objects were moved around the room and it was claimed spirits had released Decker from the bag. It was later discovered to have been a trick as Martin Sunshine, a magic dealer admitted that he sold Decker a trick mail bag, such as stage escapologists use, and had acted as the medium’s confederate by pretending to be M. Taylor, a magician. The British medium Estelle Roberts claimed to materialize an Indian spirit guide called "Red Cloud". Researcher Melvin Harris who examined some photographs of Red Cloud wrote the face was the same as Roberts and she had dressed up in a feathered war-bonnet.
In 1936 the psychical researcher Nandor Fodor tested the Hungarian apport medium Lajos Pap in London and during the séance a dead snake appeared. Pap was searched and was found to be wearing a device under his robe, where he had hidden the snake. A photograph taken at a séance in 1937 in London shows the medium Colin Evans "levitating" in mid air. He claimed that spirits had lifted him. Evans was later discovered to be a fraud as a cord leading from a device in his hand has indicated that it was himself who triggered the flash-photograph and that all he had done was jump from his chair into the air and pretend he had levitated.
According to the magician John Booth the stage mentalist David Devant managed to fool a number of people into believing he had genuine psychic ability who did not realize that his feats were magic tricks. At St. George's Hall, London he performed a fake "clairvoyant" act where he would read a message sealed inside an envelope. The spiritualist Oliver Lodge who was present in the audience was duped by the trick and claimed that Devant had used psychic powers. In 1936 Devant in his book Secrets of My Magic revealed the trick method he had used.
The physicist Kristian Birkeland exposed the fraud of the direct voice medium Etta Wriedt. Birkeland turned on the lights during a séance, snatched her trumpets and discovered that the "spirit" noises were caused by chemical explosions induced by potassium and water and in other cases by lycopodium powder. The British medium Isa Northage claimed to materialize the spirit of a surgeon known as Dr. Reynolds. When photographs taken of Reynolds were analyzed by researchers they discovered that Northage looked like Reynolds with a glued stage beard.
The magician Julien Proskauer revealed that the levitating trumpet of Jack Webber was a trick. Close examination of photographs reveal Webber to be holding a telescopic reaching rod attached to the trumpet, and sitters in his séances only believed it to have levitated because the room was so dark they could not see the rod. Webber would cover the rod with crepe paper to disguise its real construction.
In 1954, the psychical researcher Rudolf Lambert published a report revealing details about a case of fraud that was covered up by many early members of the Institute Metapsychique International (IMI). Lambert who had studied Gustav Geley's files on the medium Eva Carrière discovered photographs depicting fraudulent ectoplasm taken by her companion Juliette Bisson. Various "materializations" were artificially attached to Eva's hair by wires. The discovery was never published by Geley. Eugene Osty (the director of the institute) and members Jean Meyer, Albert von Schrenck-Notzing and Charles Richet all knew about the fraudulent photographs but were firm believers in mediumship phenomena so demanded the scandal be kept secret.
The fraudulent medium Ronald Edwin confessed he had duped his séance sitters and revealed the fraudulent methods he had used in his book Clock Without Hands (1955). The psychical researcher Tony Cornell investigated the mediumship of Alec Harris in 1955. During the séance "spirit" materializations emerged from a cabinet and walked around the room. Cornell wrote that a stomach rumble, nicotine smelling breath and a pulse gave it away that all the spirit figures were in fact Harris and that he had dressed up as each one behind the cabinet.
The British medium William Roy earned over £50,000 from his séance sitters. He confessed to fraud in 1958 revealing the microphone and trick-apparatus that he had used. The automatic writings of the Irish medium Geraldine Cummins were analyzed by psychical researchers in 1960s and they revealed that she worked as a cataloguer at the National Library of Ireland and took information from various books that would appear in her automatic writings about ancient history.
In 1960, psychic investigator Andrija Puharich and Tom O'Neill, publisher of the Spiritualist magazine Psychic Observer, arranged to film two seances at Camp Chesterfield, Indiana using infrared film, intending to procure scientific proof of spirit materializations. The medium was shown the camera beforehand, and was aware that she was being filmed. However, the film revealed obvious fraud on the part of the medium and her cabinet assistant. The expose was published in the 10 July 1960 issue of the Psychic Observer.:96–97
In 1966 the son of Bishop Pike committed suicide. After his death, Pike contacted the British medium Ena Twigg for a series of séances and she claimed to have communicated with his son. Although Twigg denied formerly knowing anything about Pike and his son, the magician John Booth discovered that Twigg had already known information about the Pike family before the séances. Twigg had belonged to the same denomination of Bishop Pike, he had preached at a cathedral in Kent and she had known information about him and his deceased son from newspapers.
In 1970 two psychical researchers investigated the direct-voice medium Leslie Flint and found that all the "spirit" voices in his séance sounded exactly like himself and attributed his mediumship to "second-rate ventriloquism". The medium Arthur Ford died leaving specific instructions that all of his files should be burned. In 1971 after his death, psychical researchers discovered his files but instead of burning them they were examined and discovered to be filled with obituaries, newspaper articles and other information, which enabled Ford to research his séance sitters backgrounds.
Ronald Pearsall in his book Table-rappers: The Victorians and the Occult (1972) documented how every Victorian medium investigated had been exposed as using trickery, in the book he revealed how mediums would even use acrobatic techniques during séances to convince audiences of spirit presences.
In 1976, M. Lamar Keene, a medium in Florida and at the Spiritualist Camp Chesterfield in Indiana, confessed to defrauding the public in his book The Psychic Mafia. Keene detailed a multitude of common stage magic techniques utilized by mediums which are supposed to give an appearance of paranormal powers or supernatural involvement.
After her death in the 1980s the medium Doris Stokes was accused of fraud, by author and investigator Ian Wilson. Wilson stated that Mrs Stokes planted specific people in her audience and did prior research into her sitters. Rita Goold a physical medium during the 1980s was accused of fraud, by the psychical researcher Tony Cornell. He claimed she would dress up as the spirits in her séances and would play music during them which provided cover for her to change clothes.
The British journalist Ruth Brandon published the book The Spiritualists (1983) which exposed the fraud of the Victorian mediums. The book received positive reviews and has been influential to skeptics of spiritualism. The British apport medium Paul McElhoney was exposed as a fraud during a séance in Osset, Yorkshire in 1983. The tape recorder that McElhoney took to his séances was investigated and a black tape was discovered bound around the battery compartment and inside carnation flowers were found as well as a key-ring torch and other objects.
In 1988, the magician Bob Couttie criticized the paranormal author Brian Inglis for deliberately ignoring evidence of fraud in mediumship. Couttie wrote Inglis had not familiarized himself with magician techniques. In 1990 the researcher Gordon Stein discovered that the levitation photograph of the medium Carmine Mirabelli was fraudulent. The photograph was a trick as there were signs of chemical retouching under Mirabelli's feet. The retouching showed that Mirabelli was not levitating but was standing on a ladder which was erased from the photograph.
In 1991, Wendy Grossman in the New Scientist criticized the parapsychologist Stephen E. Braude for ignoring evidence of fraud in mediumship. According to Grossman "[Braude] accuses sceptics of ignoring the evidence he believes is solid, but himself ignores evidence that does not suit him. If a medium was caught cheating on some occasions, he says, the rest of that medium's phenomena were still genuine." Grossman came to the conclusion that Braude did not do proper research on the subject and should study "the art of conjuring."
In 1992, Richard Wiseman analyzed the Feilding report of Eusapia Palladino and argued that she employed a secret accomplice that could enter the room by a fake door panel positioned near the séance cabinet. Wiseman discovered this trick was already mentioned in a book from 1851, he also visited a carpenter and skilled magician who constructed a door within an hour with a false panel. The accomplice was suspected to be her second husband, who insisted on bringing Palladino to the hotel where the séances took place. Massimo Polidoro and Gian Marco Rinaldi also analyzed the Feilding report but came to the conclusion no secret accomplice was needed as Palladino during the 1908 Naples séances could have produced the phenomena by using her foot.
Colin Fry was exposed in 1992 when during a séance the lights were unexpectedly turned on and he was seen holding a spirit trumpet in the air, which the audience had been led to believe was being levitated by spiritual energy. In 1997, Massimo Polidoro and Luigi Garlaschelli produced wax-moulds directly from one's hand which were exactly the same copies as Gustav Geley obtained from Franek Kluski, which are kept at the Institute Metapsychique International.
A series of mediumistic séances known as the Scole Experiment took place between 1993–98 in the presence of the researchers David Fontana, Arthur Ellison and Montague Keen. This has produced photographs, audio recordings and physical objects which appeared in the dark séance room (known as apports). A criticism of the experiment was that it was flawed because it did not rule out the possibility of fraud. The skeptical investigator Brian Dunning wrote the Scole experiments fail in many ways. The séances were held in the basement of two of the mediums, only total darkness was allowed with no night vision apparatus as it might "frighten the spirits away". The box containing the film was not examined and could easily have been accessible to fraud. And finally, even though many years have passed, there has been no follow-up, no further research by any credible agency or published accounts.
The VERITAS Research Program of the Laboratory for Advances in Consciousness and Health in the Department of Psychology at the University of Arizona, run by the parapsychologist Gary Schwartz, was created primarily to test the hypothesis that the consciousness (or identity) of a person survives physical death. Schwartz claimed his experiments were indicative of survival, but do not yet provide conclusive proof. The experiments described by Schwartz have received criticism from the scientific community for being inadequately designed and using poor controls.
Ray Hyman discovered many methodological errors with Schwartz's research including; "Inappropriate control comparisons", "Failure to use double-blind procedures", "Creating non-falsifiable outcomes by reinterpreting failures as successes" and "Failure to independently check on facts the sitters endorsed as true". Hyman wrote "Even if the research program were not compromised by these defects, the claims being made would require replication by independent investigators." Hyman criticizes Schwartz's decision to publish his results without gathering "evidence for their hypothesis that would meet generally accepted scientific criteria... they have lost credibility."
In 2003, skeptic investigator Massimo Polidoro in his book Secrets of the Psychics documented the history of fraud in mediumship and spiritualistic practices as well as the psychology of psychic deception. Terence Hines in his book Pseudoscience and the Paranormal (2003) has written:
Modern spiritualists and psychics keep detailed files on their victims. As might be expected, these files can be very valuable and are often passed on from one medium or psychic to another when one retires or dies. Even if a psychic doesn’t use a private detective or have immediate access to driver’s license records and such, there is still a very powerful technique that will allow the psychic to convince people that the psychic knows all about them, their problems, and their deep personal secrets, fears, and desires. The technique is called cold reading and is probably as old as charlatanism itself... If John Edward (or any of the other self-proclaimed speakers with the dead) really could communicate with the dead, it would be a trivial matter to prove it. All that would be necessary would be for him to contact any of the thousands of missing persons who are presumed dead—famous (e.g., Jimmy Hoffa, Judge Crater) or otherwise—and correctly report where the body is. Of course, this is never done. All we get, instead, are platitudes to the effect that Aunt Millie, who liked green plates, is happy on the other side.
An experiment conducted by the British Psychological Society in 2005 suggests that under the controlled condition of the experiment, people who claimed to be professional mediums do not demonstrate the mediumistic ability. In the experiment, mediums were assigned to work the participants chosen to be “sitters.” The mediums claimed to contact the deceased who were related to the sitters. The research gather the numbers of the statements made and have the sitters rate the accuracy of the statements. The readings that were considered to be somewhat accurate by the sitters were very generalized, and the ones that were considered inaccurate were the ones that were very specific.
On Fox News on the Geraldo at Large show, October 6, 2007, Geraldo Rivera and other investigators accused Schwartz as a fraud as he had overstepped his position as a university researcher by requesting over three million dollars from a bereaved father who had lost his son. Schwartz claimed to have contacted the spirit of a 25-year-old man in the bathroom of his parents house and it is alleged he attempted to charge the family 3.5 million dollars for his mediumship services. Schwartz responded saying that the allegations were set up to destroy his science credibility.
In 2013 Rose Marks and members of her family were convicted of fraud for a series of crimes spanning 20 years entailing between $20 and $45 million. They told vulnerable clients that to solve their problems they had to give the purported psychics money and valuables. Marks and family promised to return the cash and goods after "cleansing" them. Prosecutors established they had no intent to return the property.
The exposures of fraudulent activity led to a rapid decline in ectoplasm and materialization séances. Investigator Joe Nickell has written that modern self-proclaimed mediums like John Edward, Sylvia Browne, Rosemary Altea and James Van Praagh are avoiding the Victorian tradition of dark rooms, spirit handwriting and flying tambourines as these methods risk exposure. They instead use “mental mediumship” tactics like cold reading or gleaning information from sitters before hand (hot reading). Group readings also improve hits by making general statements with conviction, which will fit at least one person in the audience. Shows are carefully edited before airing to show only what appears to be hits and removing anything that does not reflect well on the medium.
Michael Shermer criticized mediums in Scientific American, saying, "mediums are unethical and dangerous: they prey on the emotions of the grieving. As grief counselors know, death is best faced head-on as a part of life." Shermer wrote that the human urge to seek connections between events that may form patterns meaningful for survival is a function of natural evolution, and called the alleged ability of mediums to talk to the dead "a well-known illusion of a meaningful pattern."
According to James Randi, a skeptic who has debunked many claims of psychic ability and uncovered fraudulent practices, mediums who do cold readings "fish, suggest possibilities, make educated guesses and give options." Randi has a standing offer of $1 million US dollars for anyone who can demonstrate psychic ability under controlled conditions. Most prominent psychics and mediums have not taken up his offer.
- Faith healing
- List of modern channelled texts
- List of topics characterized as pseudoscience
- The Book on Mediums
- The Spirits Book
- Theatrical seances
- Gilmore, Mernie (October 31, 2005). "A spiritual connection". The Express (London).
- Brandreth, Gyles (November 3, 2002). "Is Anybody There?". The Sunday Telegraph (London).
- Ruth Brandon. (1983). The Spiritualists: The Passion for the Occult in the Nineteenth and Twentieth Centuries. Alfred E. Knopf. ISBN 978-0394527406
- Milbourne Christopher. (1979). Search for the Soul. T. Y. Crowell. ISBN 978-0690017601
- Terence Hines. (2003). Pseudoscience and the Paranormal. Prometheus Books. ISBN 978-1573929790
- O'Keeffe, Ciaran (May 2005). "Testing Alleged Mediumship: Methods and Results". British Journal of Psychology. doi:10.1348/000712605X36361. ISSN 0007-1269.
- Thirty Years of Psychical Research by Charles Richet p. 38 The MacMillian Company 1923
- "Glossary of Key Words Frequently Used in Parapsychology", Parapsychological Association website. "Materialization: A phenomenon of physical mediumship in which living entities or inanimate objects are caused to take form, sometimes from ectoplasm." Retrieved January 24, 2006
- "Medium - Definition". Dictionary.com. Retrieved 23 March 2007.
- "Spiritism is not a religion but a science", as the famous French astronomer Camille Flammarion said in Allan Kardec's Eulogy on April 2, 1869, in Death and Its Mystery - After Death. Manifestations and Apparitions of the Dead; The Soul After Death Translated by Latrobe Carroll (London: Adelphi Terrace, 1923), archive version at Allan Kardec eulogy
- The Autobiography of a Fortune Teller by C. Doreen Phillips, Vantage Press, 1958.
- Richard Castillo (1995) Culture, Trance, and the Mind-Brain. Anthropology of Consciousness. Volume 6, Issue 1, pages 17–34, March 1995.
- Braude, Anne, Radical Spirits, Spiritualism and Women's Rights in Nineteenth Century America. Bloomington: Indiana University Press, 2001.
- Deborah Blum. (2006). Ghost Hunters, William James] and the Search for Scientic Proof of Life After Death. The Penguin Press.
- Amy Tanner. (1994, originally published 1910). Studies in Spiritism. With an introduction by G. Stanley Hall. Prometheus Press. p. 18
- God's World: A Treatise on Spiritualism Founded on Transcripts of Shorthand Notes Taken Down, Over a Period of Five Years, in the Seance-Room of the William T. Stead Memorial Center (a Religious Body Incorporated Under the Statutes of the State of Illinois), Mrs. Cecil M. Cook, Medium and Pastor. Compiled and Written by Lloyd Kenyon Jones. Chicago, Ill.: The William T. Stead Memorial Center, 1919.
- "Ectoplasm" def. Merriam Webster dictionary, Retrieved 18 January 2007
- Somerlott, Robert, Here, Mr. Splitfoot. Viking, 1971.
- Connor, Steven (1999). "9. The Machine in the Ghost: Spiritualism, Technology and the 'Direct Voice'". In Buse, Peter; Stott, Andrew. Ghosts: deconstruction, psychoanalysis, history. Palgrave Macmillan. pp. 203–225. ISBN 978-0-312-21739-6.
- "What is a psychic?". UK Psychic Readings. Retrieved 30 July 2013.
- Wood, Matthew (2007). Possession Power and the New Age: Ambiguities of Authority in Neoliberal Societies. Ashgate Publishing, Limited. ISBN 0-7546-3339-X.
- LeCron, Leslie; Bordeaux, Jean (1970). Hypnotism Today. Wilshire Book Co. p. 278. ISBN 0-87980-081-X.
When in a trance ... the medium seems to come under the control of another personality, purportedly the spirit of a departed soul, and a genuine medium undoubtedly believes the 'control' to be a spirit entity ... In the trance, the medium often enters a cataleptic state marked by extreme rigidity. The control then takes over, the voice may change completely ... and the supposed spirit answers the questions of the sitter, telling of things 'on the other plane' and gives messages from those who have 'passed over.'
- Brown, Michael F. (1999). The Channeling Zone: American Spirituality in an Anxious Age. Harvard University Press. ISBN 0-674-10883-3.
- Klimo, Jon (1998). Channeling: Investigations on Receiving Information from Paranormal Sources. North Atlantic Books. p. 100. ISBN 978-1-55643-248-4.
- Chalmers, Robert (8 July 2007). "Interview: The couple who claim they can make you rich beyond your wildest dreams". The Independent.
- Koven, Jean-Claude (2004). Going Deeper: How to Make Sense of Your Life When Your Life Makes No Sense. Prism House Press. p. 389. ISBN 0-972-39545-8.
- Wilcock, David (2014). The Synchronicity Key: The Hidden Intelligence Guiding the Universe and You. Plume. ISBN 0-142-18108-0.
- DifferenceBetween.net Retrieved 28 December 2011
- "Glossary of Key Words Frequently Used in Parapsychology", Parapsychological Association website, Retrieved January 29, 2007
- Ilya Vinitsky. (2009). Ghostly Paradoxes: Modern Spiritualism and Russian Culture in the Age of Realism. University of Toronto Press. p. 25. ISBN 978-0802099358
- Harvey J. Irwin, Caroline Watt. (2007). An Introduction to Parapsychology. McFarland. pp. 138-144. ISBN 978-0786430598
- Theodore Schick; Lewis Vaughn. (2013). How to Think About Weird Things: Critical Thinking for a New Age. McGraw-Hill Higher Education. ISBN 978-0-07-752631-3
- David Marks. (2000). The Psychology of the Psychic. Prometheus Books. ISBN 978-1573927987
- Nicola Holt, Christine Simmonds-Moore, David Luke, Christopher French. (2012). Anomalistic Psychology (Palgrave Insights in Psychology). Palgrave Macmillan. ISBN 978-0230301504
- Millais Culpin. (1920). Spiritualism and the New Psychology, an Explanation of Spiritualist Phenomena and Beliefs in Terms of Modern Knowledge. Kennelly Press. ISBN 978-1446056516
- Joseph Rinn. (1950). Sixty Years of Psychical Research. New York: Truth Seeker. pp. 200-205
- Wolffram, Heather. (2012). ‘Trick’, ‘Manipulation’ and ‘Farce’: Albert Moll’s Critique of Occultism. Medical History 56(2): 277-295.
- Leonard Zusne, Warren H. Jones. (1989). Anomalistic Psychology: A Study of Magical Thinking. Psychology Press. p. 221. ISBN 978-0805805086 "The spirits, controls, and guides of a medium are the products of the medium's own psychological dynamics. On the one hand, they personify the medium's hidden impulses and wish life. On the other, they are also shaped by the expectations of the medium's sitters, the medium's experience, the cultural background, and the spirit of the times."
- Ian Rowland. (1998). The full facts book of cold reading. London, England: Ian Roland. ISBN 978-0955847608
- Brad Clark (2002). Spiritualism. pp. 220-226. In Michael Shermer. The Skeptic Encyclopedia of Pseudoscience. ABC-CLIO. ISBN 978-1576076538
- Jonathan Smith. (2009). Pseudoscience and Extraordinary Claims of the Paranormal: A Critical Thinker's Toolkit. Wiley-Blackwell. pp. 141-241. ISBN 978-1405181228
- Richard Wiseman. (2011). Paranormality: Why We See What Isn't There. Macmillan. p. 38. ISBN 978-0-230-75298-6
- Wiseman, R., Greening, E., and Smith, M. (2003). Belief in the paranormal and suggestion in the seance room. British Journal of Psychology, 94 (3): 285-297.
- Massimo Polidoro. (2003). Secrets of the Psychics: Investigating Paranormal Claims. Prometheus Books. ISBN 978-1591020868
- James Houran. (2004). From Shaman to Scientist: Essays on Humanity's Search for Spirits. Scarecrow Press. p. 177. ISBN 978-0810850545 Also see Michael Shermer. (2002). The Skeptic Encyclopedia of Pseudoscience. ABC-CLIO. pp. 220-226. ISBN 978-1576076538
- Paul Kurtz. (1985). A Skeptic's Handbook of Parapsychology. Prometheus Books. ISBN 978-0879753009
- Lewis Spence. (2003). An Encyclopaedia of Occultism. Dover. p. 172
- Alan Gauld. (1968). The Founders of Psychical Research. Routledge & K. Paul.
- Janet Oppenheim. (1988). The Other World: Spiritualism and Psychical Research in England, 1850-1914. Cambridge University Press. ISBN 978-0521347679
- The Problem of Fraud by Paul Kurtz
- Chung Ling Soo. (1898). Spirit Slate Writing and Kindred Phenomena. Munn & Company. Henry Evans. (1897). Hours With the Ghosts Or Nineteenth Century Witchcraft. Kessinger Publishing. Julien Proskauer. (1932). Spook crooks! Exposing the secrets of the prophet-eers who conduct our wickedest industry. New York, A. L. Burt.
- Joseph Dunninger. (1935). Inside the Medium's Cabinet. New York, D. Kemp and Company. Harry Houdini. (1924). A Magician Among the Spirits. Cambridge University Press. Joseph Rinn. (1950). Sixty Years Of Psychical Research: Houdini And I Among The Spiritualists. Truth Seeker.
- Preliminary Report of the Commission Appointed by the University of Pennsylvania, The Seybert Commission, 1887. 1 April 2004.
- Spiritualism (religion) :: History - Britannica Online Encyclopedia
- Joseph McCabe. (1920). Spiritualism: A Popular History from 1847. Dodd, Mead and Company. pp. 110-112. A Mr. Merrifield was present at one of the sittings. Home's usual phenomena were messages, the moving of objects (presumably at a distance), and the playing of an accordion which he held with one hand under the shadow of the table. But from an early date in America he had been accustomed occasionally to "materialise" hands (as it was afterwards called). The sitters would, in the darkness, faintly see a ghostly hand and arm, or they might feel the touch of an icy limb. Mr. Merrifield and the other sitters saw a "spirit-hand" stretch across the faintly lit space of the window. But Mr. Merrifield says that Home sat, or crouched, low in a low chair, and that the "spirit-hand" was a false limb on the end of Home's arm. At other times, he says, he saw that Home was using his foot."
- Donald Serrell Thomas. (1989). Robert Browning: A Life Within Life. Weidenfeld and Nicolson. pp. 157-158. ISBN 978-0297796398
- Harry Houdini. (2011 reprint edition). Originally published in 1924. A Magician Among the Spirits. Cambridge University Press. p. 42. ISBN 978-1108027489
- John Casey. (2009). After Lives: A Guide to Heaven, Hell and Purgatory. Oxford. p. 373. ISBN 978-0199975037 "The poet attended one of Home's seances where a face was materialized, which, Home's spirit guide announced, was that of Browning's dead son. Browning seized the supposed materialized head, and it turned out to be the bare foot of Home. The deception was not helped by the fact that Browning never had lost a son in infancy."
- Joseph McCabe. (1920). Is Spiritualism based on Fraud?: The Evidence Given by Sir A.C. Doyle and Others Drastically Examined. London: Watts & Co. pp. 48-50. Also see the review of The Enigma of Daniel Home: Medium or Fraud? by Trevor H. Hall in F. B. Smith. (1986). Victorian Studies. Volume. 29, No. 4. pp. 613-614.
- Joe Nickell. (2001). Real-Life X-Files: Investigating the Paranormal. The University Press of Kentucky. pp. 267-268. ISBN 978-0813122106
- Sherrie Lynne Lyons. (2010). Species, Serpents, Spirits, and Skulls: Science at the Margins in the Victorian Age. State University of New York Press. p. 100. ISBN 978-1438427980
- Alex Owen. (2004). The Darkened Room: Women, Power, and Spiritualism in Late Victorian England. University Of Chicago Press. pp. 70-71. ISBN 978-0226642055
- Massimo Polidoro. (2000). Anna Eva Fay: The Mentalist Who Baffled Sir William Crookes. Skeptical Inquirer 24: 36-38.
- Georgess McHargue. (1972). Facts, Frauds, and Phantasms: A Survey of the Spiritualist Movement. Doubleday. p. 113. ISBN 978-0385053051
- Janet Oppenheim. (1985). The Other World: Spiritualism and Psychical Research in England, 1850-1914. Cambridge University Press. p. 19. ISBN 978-0521265058
- Paul Kurtz. (1985). A Skeptic's Handbook of Parapsychology. Prometheus Books. p. 29. ISBN 978-0879753009 "Florence Cook was caught cheating not only before her séances with Crookes but also afterward. Furthermore, she learned her trade from the mediums Frank Herne and Charles Williams, who were notorious for their cheating." Also see M. Lamar Keene. (1997). The Psychic Mafia. Prometheus Books. p. 64. ISBN 978-1573921619 "The most famous of materialization mediums, Florence Cook-- though she managed to convince a scientist, Sir William Crookes, that she was genuine-- was repeatedly exposed in fraud. Florence had been trained in the arts of the séance by Frank Herne, a well-known physical medium whose materializations were grabbed on more than one occasion and found to be the medium himself."
- Joseph McCabe. (1920). Spiritualism: A Popular History from 1847. Dodd, Mead and Company. pp. 160-161
- Chung Ling Soo. (1898). Spirit Slate Writing and Kindred Phenomena. Munn & Company. pp. 105-106
- Lewis Spence. (1991). Encyclopedia of Occultism & Parapsychology. Gale Research Company. p. 1106
- Adin Ballou. (2001). The Rise of Victorian Spiritualism. Routledge. p. 16
- Joseph McCabe. (1920). Is Spiritualism based on Fraud?: The Evidence Given by Sir A.C. Doyle and Others Drastically Examined. London: Watts & Co. p. 115
- Roy Stemman. (1976). The Supernatural. Danbury Press. p. 62
- Joseph McCabe. (1920). Spiritualism: A Popular History From 1847. T. F. Unwin Ltd. p. 167
- Trevor H. Hall. (1963). The Spiritualists: The Story of Florence Cook and William Crookes. Helix Press. p. 10
- Trevor H. Hall. (1980). The Strange Case of Edmund Gurney. Duckworth. p. 47
- Washington Irving Bishop. (1880). Second Sight Explained: A Complete Exposition of Clairvoyance or Second Sight. Edinburgh: John Menzies.
- Preliminary report of the Commission appointed by the University of Pennsylvania to investigate modern spiritualism, in accordance with the request of the late Henry Seybert (1887).
- Paul Boyer. The Oxford Companion to United States History. Oxford University Press. p. 738. ISBN 978-0195082098
- Rodger Anderson. (2006). Psychics, Sensitives and Somnambules. McFarland & Company. p. 90. ISBN 978-0786427703
- Will Goldston. (1942). Tricks Of The Masters. G. Routledge & Sons, Ltd. p. 4
- Melvin Harris. (2003). Investigating the Unexplained: Psychic Detectives, the Amityville Horror-mongers, Jack the Ripper, and Other Mysteries of the Paranormal. Prometheus Books. p. 21. ISBN 978-1591021087
- Samri Baldwin. (1895). The Secrets of Mahatma Land Explained Brooklyn, N.Y., Press of T. J. Dyson & Son.
- Harry Houdini. (2011). A Magician Among the Spirits. Cambridge University Press. p. 66. ISBN 978-1108027489
- Joe Nickell. (2001). Real-Life X-Files: Investigating the Paranormal. The University Press of Kentucky. pp. 260-261. Also see Joe Nickell. (2005). Camera Clues: A Handbook for Photographic Investigation. The University Press of Kentucky. p. 151
- Hereward Carrington. (1907). The Physical Phenomena of Spiritualism. Herbert B. Turner & Co. pp. 206-223
- Donald West. (1954). Psychical Research Today. Chapter Séance-Room Phenomena. Duckworth. p. 49
- Gordon Stein. (1996). The Encyclopedia of the Paranormal. Prometheus Books. p. 520. ISBN 978-1573920216
- Chung Ling Soo. (1898). Spirit Slate Writing and Kindred Phenomena. Munn & Company. pp. 101-104
- Ivor Lloyd Tuckett. (1911). The Evidence for the Supernatural: A Critical Study Made with "Uncommon Sense". Kegan Paul, Trench, Trübner & Company. pp. 52-53
- Julian Franklyn. (1935). A Survey of the Occult. Kessinger Publishing. p. 248
- Joseph Jastrow. (1911). Studies in Spiritism by Amy E. Tanner. The American Journal of Psychology. Vol. 22, No. 1. pp. 122-124.
- Martin Gardner. Are Universes Thicker Than Blackberries? "How Mrs. Piper Bamboozled William James". W. W. Norton & Company. pp. 252–62.
- Ivor Lloyd Tuckett. (1911). The Evidence for the Supernatural: A Critical Study Made with "Uncommon Sense". K. Paul, Trench, Trübner. pp. 321-395
- Corinna Treitel. (2004). A Science for the Soul: Occultism and the Genesis of the German Modern. The Johns Hopkins University Press. p. 165. ISBN 978-0801878121
- Harry Price. (1939). Fifty Years of Psychical Research. Kessinger Publishing. ISBN 978-0766142428
- Richard Wiseman. (1997). Deception & Self-Deception: Investigating Psychics. Prometheus Books. p. 23
- Richard Wiseman. (1997). Deception & Self-Deception: Investigating Psychics. Prometheus Books. p. 12
- William Hodson Brock. (2008). William Crookes (1832-1919) and the Commercialization of Science. Ashgate. p. 474. ISBN 978-0754663225
- Hereward Carrington. (1907). The Physical Phenomena of Spiritualism. Herbert B. Turner & Co.
- Rodger Anderson. (2006). Psychics, Sensitives And Somnambules. McFarland & Company. p. 26. ISBN 978-0786427703
- The New Paranatural Paradigm: Claims of Communicating with the Dead by Paul Kurtz
- Milbourne Christopher. (1971). ESP, Seers & Psychics. Crowell. pp. 188-204. ISBN 978-0690268157
- Everard Feilding, William Marriott. (1910). Report on Further Series of Sittings with Eusapia Palladino at Naples. Proceedings of the Society for Psychical Research. Volume 15. pp. 20–32.
- J. Gordon Melton. (2007). The Encyclopedia of Religious Phenomena. Visible Ink Press. p. 12. ISBN 978-1578592098
- Eric Dingwall. (1927). How to Go to a Medium. K. Paul, Trench, Trübner. pp. 31-32.
- Theodore Annemann. (1983). Practical Mental Magic. Dover Publications. pp. 7-11
- Pearson's Magazine. June 1910. C. Arthur Pearson Ltd. p. 615
- Joseph McCabe. (1920). Is Spiritualism Based On Fraud? The Evidence Given By Sir A. C. Doyle and Others Drastically Examined. London Watts & Co. pp. 33-34
- Edward Clodd. (1917). The Question: A Brief History and Examination of Modern Spiritualism. Chapter Mrs. Leonard and Others. pp. 215-241
- Charles Arthur Mercier. (1917). Spiritualism and Sir Oliver Lodge. London: Mental Culture Enterprise.
- Joseph Jastrow (1918). The Psychology of Conviction. Houghton Mifflin Company. pp. 101-127
- Fakebusters II: Scientific Detection of Fakery in Art and Philately
- Harry Price, Fifty Years of Psychical Research, chapter XI: The Mechanics of Spiritualism, F&W Media International, Ltd, 2012.
- Harry Price. (1939). Chapter The Mechanics of Spiritualism in Fifty Years of Psychical Research. Kessinger Publishing. ISBN 978-0766142428
- G. K. Nelson. (2013). Spiritualism and Society. Routledge. p. 159. ISBN 978-0415714624
- Clément Chéroux. (2005). The Perfect Medium: Photography and the Occult. Yale University Press. p. 268. ISBN 978-0300111361
- D. Scott Rogo. (1978). Mind and Motion: The Riddle of Psychokinesis. Taplinger Publishing. pp. 245-246. ISBN 978-0800824556
- Massimo Polidoro. (2001). Final Séance: The Strange Friendship Between Houdini and Conan Doyle. Prometheus Books. pp. 71-73. ISBN 978-1573928960
- Julian Franklyn. (2003). A Survey of the Occult. pp. 238-239. Kessinger Publishing. ISBN 978-0766130074
- Joseph McCabe. (1920). Spiritualism: A Popular History from 1847. Dodd, Mead and Company. p. 192
- Photos of Ghosts: The Burden of Believing the Unbelievable by Massimo Polidoro
- Edmund Edward Fournier d'Albe. (1922). The Goligher Circle. J. M. Watkins. p. 37
- Universitetskomiteen, Mediet Einer Nielsen, kontrolundersøkelser av universitetskomiteen i Kristiania. (Kristiania 1922). ”Rapport fra den av Norsk Selskab for Psykisk Forskning nedsatte Kontrolkomité”, Norsk Tidsskrift for Psykisk Forskning 1 (1921-22).
- Lewis Spence. (2003). Encyclopedia of Occultism & Parapsychology. Kessinger publishing. p. 399. ISBN 978-0766128156
- Eric Dingwall, Harry Price. (1922). Revelations of a Spirit Medium. Kegan Paul, Trench, Trübner & Co.
- Georgess McHargue. (1972). Facts, Frauds, and Phantasms: A Survey of the Spiritualist Movement. Doubleday. p. 158. ISBN 978-0385053051
- Carlos María de Heredia. (1923). Spirit Hands, "ectoplasm," and Rubber Gloves. Popular Mechanics. pp. 14-15
- Paul Tabori. (1961). The Art of Folly. Prentice-Hall International, Inc. pp. 178-179
- "Fraudulent Mediums". Lyceum Library.
- Julian Franklyn. (2003). Dictionary of the Occult. Kessinger Publishing. p. 228
- Harry Price. (1936). Confessions of a Ghost-Hunter. Putnam. p. 232
- Warren Jay Vinton. The Famous Schneider Mediumship: A Critical Study of Alleged Supernormal Events. No. 4 April 1927 in C. K. Ogden Psyche: An Annual General and Linguistic Psychology. 1920-1952 Routledge/Thoemmes Press, 1995.
- Further Tests of the Medium Rudi Schneider. (1934). Nature 134, 965-966.
- John Booth. (1986). Psychic Paradoxes. Prometheus Books. p. 8. ISBN 978-0879753580
- Bob Couttie. (1988). Forbidden Knowledge: The Paranormal Paradox. Lutterworth Press. pp. 104-105
- Brian Righi. (2008). Ghosts, Apparitions and Poltergeists: An Exploration of the Supernatural through History. Llewellyn Publications. Llewellyn Publications. p. 52. ISBN 978-0738713632 "One medium of the 1920s, Mina Crandon, became famous for producing ectoplasm during her sittings. At the height of the séance, she was even able to produce a tiny ectoplasmic hand from her navel, which waved about in the darkness. Her career ended when Harvard biologists were able to examine the tiny hand and found it to be nothing more than a carved piece of animal liver."
- E. Clephan Palmer. (2003). The Riddle of Spiritualism. Kessinger Publishing. pp. 35-39. ISBN 978-0766179318
- Lewis Spence. (1991). Encyclopedia of Occultism & Parapsychology. Gale Research Company. p. 1522. Massimo Polidoro. (2001). Final Seance: The Strange Friendship Between Houdini and Conan Doyle. Prometheus Books. p. 103. ISBN 978-1573928960
- Lewis Spence. (2003). Encyclopedia of Occultism & Parapsychology. Kessinger Publishing. p. 880
- Melvin Harris. (2003). Investigating the Unexplained: Psychic Detectives, the Amityville Horror-mongers, Jack the Ripper, and Other Mysteries of the Paranormal. Prometheus Books. p. 176. ISBN 978-1591021087
- Harry Price. (1931). Regurgitation and the Duncan Mediumship. (Bulletin I of the National Laboratory of Psychical Research, 120pp with 44 illustrations.)
- Marina Warner. (2008). Phantasmagoria: Spirit Visions, Metaphors, and Media into the Twenty-first Century. Oxford University Press. p. 299
- Jason Karl. (2007). An Illustrated History of the Haunted World. New Holland Publishers. p. 79
- Touching the Dead: Spooky Winnipeg by Tom Jokinen
- Joseph Jastrow. (1935). Patience Worth: An Alter Ego in Wish and Wisdom: Episodes in the Vagaries of Belief. D. Appleton-Century Company. pp. 78-92. Lyon Sprague de Camp. (1966). Spirits, Stars, and Spells. New York: Canaveral. p. 247. Robert Goldenson. (1973). Mysteries of the Mind: The Drama of Human Behavior. Doubleday. pp. 44-53. Milbourne Christopher. (1970). ESP, Seers and Psychics. New York: Crowell. pp. 128-129
- Patience Worth by Robert Todd Carroll
- Julian Franklyn. (2003). A Survey of the Occult. pp. 263-395. Kessinger Publishing. ISBN 978-0766130074
- M. Lamar Keene. (1997). The Psychic Mafia. Prometheus Books. p. 123. ISBN 978-1573921619
- Melvin Harris. (2003). Investigating the Unexplained: Psychic Detectives, the Amityville Horror-mongers, Jack the Ripper, and Other Mysteries of the Paranormal. Prometheus Books. p. 21. ISBN 978-0879753580
- Nandor Fodor. (1960). The Haunted Mind: A Psychoanalyst Looks at the Supernatural. Helix Press.
- Joe Nickell. (2005). Camera Clues: A Handbook for Photographic Investigation. The University Press of Kentucky. pp. 177-178. ISBN 978-0813191249
- John Booth. (1986). Psychic Paradoxes. Prometheus Books. pp. 15-16. ISBN 978-0879753580
- Joseph McCabe. (1920). Is Spiritualism based on Fraud?: The Evidence Given by Sir A.C. Doyle and Others Drastically Examined. London: Watts & CO. p. 126
- Melvin Harris. (2003). Investigating the Unexplained: Psychic Detectives, the Amityville Horror-mongers, Jack the Ripper, and Other Mysteries of the Paranormal. Prometheus Books. p. 22. ISBN 978-1591021087
- Julien Proskauer. (1946). The Dead Do Not Talk. Harper & Brothers. p. 94
- Sofie Lachapelle. (2011). Investigating the Supernatural: From Spiritism and Occultism to Psychical Research and Metapsychics in France, 1853-1931. Johns Hopkins University Press. pp. 144-145. ISBN 978-1421400136
- Ronald Edwin. (1955). Clock Without Hands. Sidgwick.
- Tony Cornell. (2002). Investigating the Paranormal. Helix Press New York. pp. 327-338. ISBN 978-0912328980
- Georgess McHargue. (1972). Facts, Frauds, and Phantasms: A Survey of the Spiritualist Movement. Doubleday. p. 250. ISBN 978-0385053051
- Eric Robertson Dodds. (2000). Missing Persons: An Autobiography. Oxford University Press. pp. 105-106. ISBN 978-0198120865
- Allen Spraggett, The Unexplained, (New York: New American Library, 1967).
- John Booth. (1986). Psychic Paradoxes. Prometheus Books. p. 148. ISBN 978-0879753580
- M. Lamar Keene. (1997). The Psychic Mafia. Prometheus Books. p 122. ISBN 978-1573921619 "A medium still riding high in England is Leslie Flint, famed as an exponent of direct voice. William Rauscher and Allen Spraggett, who attended a sitting Flint held in 1970 in New York, said that it was the most abysmal flop of any seance they had endured. All the spirit voices sounded exactly like the medium and displayed an incredible ignorance of nearly everything pertaining to the sitters. The "mediumship " was second-rate ventriloquism."
- Tim Madigan, David Goicoechea, Paul Kurtz. Promethean Love: Paul Kurtz and the Humanistic Perspective on Love. Cambridge Scholars Press. p. 293
- Ronald Pearsall. Table-rappers: The Victorians and the Occult The History Press Ltd; New Ed edition, 2004 ISBN 0-7509-3684-3
- Keene, Lamar (1997). The Psychic Mafia. Prometheus Books. ISBN 1-57392-161-0 (Republication of 1976 edition by St. Martin's Press.)
- Ian Wilson. (1989). The After Death Experience. William Morrow and Company. ISBN 978-0688080006
- Tony Cornell. (2002). Investigating the Paranormal. Helix Press New York. pp. 347-352. ISBN 978-0912328980
- Martin Gardner. (1988). The New Age: Notes of a Fringe Watcher. Prometheus Books. p. 175. ISBN 978-0879754327
- Melvin Harris. (2003). Investigating the Unexplained: Psychic Detectives, the Amityville Horror-mongers, Jack the Ripper, and Other Mysteries of the Paranormal. Prometheus Books. pp. 22-23. ISBN 978-1591021087
- Bob Couttie. (1988). Forbidden Knowledge: The Paranormal Paradox. Lutterworth Press. p. 24. ISBN 978-0718826864
- Joe Nickell. (2005). Camera Clues: A Handbook for Photographic Investigation. The University Press of Kentucky. p. 178. ISBN 978-0813191249
- Grossman, Wendy. (1991). Dismissal is not disproof. New Scientist. Vol. 130. Issue 1768, p. 53.
- Richard Wiseman. (1997). Chapter 3 The Feilding Report: A Reconsideration. In Deception and Self-Deception: Investigating Psychics. Prometheus Press. ISBN 1-57392-121-1
- Massimo Polidoro. (2003). Secrets of the Psychics: Investigating Paranormal Claims. Prometheus Books. pp. 65-95. ISBN 978-1591020868
- Colin Fry an Evaluation
- Massimo Polidoro. (2003). Secrets of the Psychics: Investigating Paranormal Claims. Prometheus Books. pp. 168-176. ISBN 978-1591020868
- "The Scole Experiment: Said to be the best evidence yet for the afterlife -- but how good is that evidence?". Skeptoid. 2009-11-10. Retrieved 2011-10-30.
- The VERITAS Research Program of the Laboratory for Advances in Consciousness and Health in the Department of Psychology at the University of Arizona
- The Truth about Medium by Gary E. Schwartz, Ph. D., with William L. Simon, Hampton Books, 2005, page 119
- Book Review by Robert T. Carroll
- Gary Schwartz's Subjective Evaluation of Mediums: Veritas or Wishful Thinking by Robert Todd Carroll
- Hyman, Ray (Jan–Feb 2003). "How Not to Test Mediums: Critiquing the Afterlife Experiments". Skeptical Inquirer Magazine. Retrieved 2012-05-21.
- Terence Hines. (2003). Pseudoscience and the Paranormal. Prometheus Books. pp. 56-64. ISBN 978-1573929790
- O'Keeffe, Ciaran (May 2005). "Testing Alleged Mediumship: Methods and Results". British Journal of Psychology. doi:10.1348/000712605X36361. ISSN 0007-1269.
- Aykroyd, Peter. and Nart, Angela. (2009). A History of Ghosts: the True Story of Seances, Mediums, Ghosts, and Ghostbusters. Rodale. p. 216. ISBN 978-1605298757
- Geraldo at Large show, October 6, 2007
- "Jury Convicts Defendant in $25 Million Fraud Scheme" (Press release). Southern District of Florida, US Attorney's Office, US Department of Justice. 2013-09-26. Retrieved 2013-10-10.
- Musgrave, Jane (2013-09-27). "Psychic convicted on all fraud counts". The Palm Beach Post 105 (171) (First ed.). p. 1.
- Vasquez, Michael (2011-08-16). "Psychic scam a $40 million Fort Lauderdale - family affair, feds allege - A Fort Lauderdale family spent the last 20 years raking in millions as fake psychics, prosecutors allege in a newly unsealed indictment". The Miami Herald. – via NewsBank (subscription required).
- J. Gordon Melton. (2007). The Encyclopedia of Religious Phenomena. Visible Ink Press. p. 96. ISBN 978-1578592098
- "Investigative Files: John Edward: Hustling the Bereaved". CSI. Nov–Dec 2001. Retrieved 2011-05-12.
- Shermer, Michael. "Deconstructing the Dead, "Crossing over" to expose the tricks of popular spirit mediums". August 2001. Scientific American. Retrieved 24 December 2011.
- "James Randi's Swift - April 21, 2006". Randi.org. Retrieved 2012-01-03.
- Woliver, Robbie (July 16, 2000). "An Encounter With a Television Psychic". The New York Times. Retrieved 24 December 2011.
- Ruth Brandon. (1983). The Spiritualists: The Passion for the Occult in the Nineteenth and Twentieth Centuries. Alfred E. Knopf. ISBN 978-0394527406
- Edward Clodd. (1917). The Question: A Brief History and Examination of Modern Spiritualism. Grant Richards, London.
- Stuart Cumberland. (1919). Spiritualism: The Inside Truth. London: Odhams.
- Joseph Dunninger. (1935). Inside the Medium's Cabinet. New York, D. Kemp and Company.
- Willis Dutcher. (1922). On the Other Side of the Footlights: An Expose of Routines, Apparatus and Deceptions Resorted to by Mediums, Clairvoyants, Fortune Tellers and Crystal Gazers in Deluding the Public. Berlin, WI: Heaney Magic.
- Walter Mann. (1919). The Follies and Frauds of Spiritualism. Rationalist Association. London: Watts & Co.
- Joseph McCabe. (1920). Scientific Men and Spiritualism: A Skeptic's Analysis. The Living Age. June 12. pp. 652–657. A skeptical look at SPR members who had supported Spiritualism, concludes they were duped by fraudulent mediums.
- Joseph McCabe. (1920). Is Spiritualism Based On Fraud? The Evidence Given By Sir A. C. Doyle and Others Drastically Examined. London: Watts & Co.
- Georgess McHargue. (1972). Facts, Frauds, and Phantasms: A Survey of the Spiritualist Movement. Doubleday. ISBN 978-0385053051
- Alex Owen. (2004). The Darkened Room: Women, Power, and Spiritualism in Late Victorian England. University Of Chicago Press. ISBN 978-0226642055
- Frank Podmore. (1911). The Newer Spiritualism. Henry Holt and Company.
- Massimo Polidoro. (2003). Secrets of the Psychics: Investigating Paranormal Claims. Prometheus Books. ISBN 978-1591020868
- Harry Price and Eric Dingwall. (1975). Revelations of a Spirit Medium. Arno Press. Reprint of 1891 edition by Charles F. Pidgeon. This rare, overlooked, and forgotten, book gives the "insider's knowledge" of 19th century deceptions.
- Joseph Rinn. (1950). Sixty Years Of Psychical Research: Houdini And I Among The Spiritualists. Truth Seeker.
- Chung Ling Soo. (1898). Spirit Slate Writing and Kindred Phenomena. Munn & Company.
- Richard Wiseman. (1997). Deception & Self-Deception: Investigating Psychics. Prometheus Books. ISBN 978-1573921213
- Houdini v. The Blond Witch of Lime Street: A Historical Lesson in Skepticism - Massimo Polidoro
- How to Have a Séance: Tricks of the Fraudulent Mediums
- John Edward: Hustling the Bereaved - Joe Nickell
- Mediumship - Skeptic's Dictionary
- The ‘Medium’ Is Not the Messenger - James Randi
- Tricks of Fake Mediums - Harry Houdini
- Media related to Mediumship at Wikimedia Commons
- The dictionary definition of Mediumship at Wiktionary