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 include seeing spirit and visions instilled by the spirit world. The Parapsychological Association defines "clairvoyance" as information derived directly from an external physical source. https://drive.google.com/file/d/1RnQYA3idIVAwYhFUujDiS6HLuqkbAWeG/view?usp=sharing
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 Books of Samuel in the Jewish Tanakh (the basis of the Old Testament).
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. https://drive.google.com/file/d/1Zh3T7RuksHd5otikwphwAW6hgGTlHjfr/view?usp=sharing
While there are a few different forms of mediumship, I work as a mental medium, which means I communicate with spirits through the use of telepathy. Spirits impress my mind and body with thoughts and feelings that come in the form of "clairs." I mentally "hear" (clairaudience), "see" (clairvoyance), "know" (claircognizance) and/or "feel" (clairsentience) messages from spirits. I like to say that I act as the bridge between the spiritual and the physical world, with the intention of healing both worlds.
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 his moving across a connecting ledge between two iron balconies.
From its earliest beginnings to contemporary times, mediumship practices have had many instances of fraud and trickery. 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 have been 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:
^ "Glossary of Key Words Frequently Used in Parapsychology" Archived 2010-12-24 at the Wayback Machine, 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.