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.[71] Frank Herne a British medium who formed a partnership with the medium Charles Williams was repeatedly exposed in fraudulent materialization séances.[72] 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."[73] Florence Cook had been "trained in the arts of the séance" by Herne and was repeatedly exposed as a fraudulent medium.[74]
Ten mediums—five less expert and five experienced—were injected with a radioactive tracer to capture their brain activity during normal writing and during the practice of psychography, which involves allegedly channeling written communication from the "other side" while in a trance-like state. The subjects were scanned using SPECT (single photon emission computed tomography) to highlight the areas of the brain that are active and inactive during the practice.
The movement quickly spread throughout the world; though only in the United Kingdom did it become as widespread as in the United States.[4] Spiritualist organizations were formed in America and Europe, such as the London Spiritualist Alliance, which published a newspaper called The Light, featuring articles such as "Evenings at Home in Spiritual Séance", "Ghosts in Africa" and "Chronicles of Spirit Photography", advertisements for "Mesmerists" and patent medicines, and letters from readers about personal contact with ghosts.[39] In Britain, by 1853, invitations to tea among the prosperous and fashionable often included table-turning, a type of séance in which spirits were said to communicate with people seated around a table by tilting and rotating the table. One prominent convert was the French pedagogist Allan Kardec (1804–1869), who made the first attempt to systematise the movement's practices and ideas into a consistent philosophical system. Kardec's books, written in the last 15 years of his life, became the textual basis of spiritism, which became widespread in Latin countries. In Brazil, Kardec's ideas are embraced by many followers today.[1][2][40] In Puerto Rico, Kardec's books were widely read by the upper classes, and eventually gave birth to a movement known as mesa blanca (white table).
Tarot cards have been greatly popularized, but can be often regarded solely as entertainment. Traditional decks are available in chain bookstores. New decks also frequently appear in New Age bookstores. Though not requiring psychic abilities, Tarot cards can be used as a psychic or cold reading tool and Tarot readings are common at psychic fairs.[5][23]
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".[170] 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.[171]