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.
Astral projection Astrology Aura Bilocation Clairvoyance Close encounter Cold spot Conjuration Cryptozoology Demonic possession Demonology Ectoplasm Electronic voice phenomenon Exorcism Extrasensory perception Forteana Ghost hunting Indigo children Magic Mediumship Occult Orb Paranormal fiction Paranormal television Precognition Preternatural Psychic Psychic reading Psychokinesis Psychometry Remote viewing Retrocognition Spirit photography Spirit possession Spirit world Spiritualism Stone Tape Supernatural Telepathy Ufology
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.