Mina "Margery" Crandon was an American psychic medium who said that she channeled her dead brother, Walter Stinson. Investigators who studied Crandon concluded that she had no such paranormal ability, and others detected her in outright deception. She became known as her alleged paranormal skills were touted by Sherlock Holmes author Sir Arthur Conan Doyle and were disproved by magician Harry Houdini. Crandon was investigated by members of the American Society for Psychical Research and employees of the Scientific American.

Mediumship is the pseudoscientific practice of mediating communication between familiar spirits or spirits of the dead and living human beings. Practitioners are known as "mediums" or "spirit mediums". There are different types of mediumship or spirit channelling, including séance tables, trance, and ouija. The practice is associated with spiritualism and spiritism. A similar New Age practice is known as channeling.