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.
The word clairvoyance means “to see clearly.” This does not refer to the sense of sight, but rather to seeing with what some call the “inner eye” or “third eye.” Others may refer to this ability as a “sixth sense.” What’s common to all of these terms and definitions is that they refer to an ability to perceive hidden truths. Clairvoyant psychics have the ability to tap into energies that the average person is not able to perceive. For this reason, many people turn to clairvoyants for guidance in various areas of their lives.