Mina Crandon claimed to materialize a "spirit hand", but when examined by biologists the hand was discovered to be made from a piece of carved animal liver. The German apport medium Heinrich Melzer was discovered to be a fraud in 1926. In a séance psychical researchers found that Melzer had small stones attached to the back of his ears by flesh coloured tape. Psychical researchers who investigated the mediumship of Maria Silbert revealed that she used her feet and toes to move objects in the séance room.
An experiment conducted by the British Psychological Society in 2005 suggests that under the controlled condition of the experiment, people who claimed to be professional mediums do not demonstrate the mediumistic ability. In the experiment, mediums were assigned to work the participants chosen to be "sitters." The mediums claimed to contact the deceased who were related to the sitters. The research gather the numbers of the statements made and have the sitters rate the accuracy of the statements. The readings that were considered to be somewhat accurate by the sitters were very generalized, and the ones that were considered inaccurate were the ones that were very specific.
Sandy gave me the main number to call and the four-digit extension I needed in order to get callers routed my way. I followed the prompts and found I’d already been entered into the system as an expert on “love”—they were psychic! I recorded a message for callers in which I explained I was “Natalie” and that I would use tarot to answer all their relationship questions. ESP Net’s online guidance site had a page-and-a-half-long, exceptionally sincere opening we could use on our callers: ” … as soon as I heard your voice I saw the most beautiful aura around you … I felt immediately that you are one of the world’s very special people … This is one of the most exciting readings I’ve done in a long time … I am the one person you needed to talk to, to receive the answers and the help you need in your life at this critical time. …” The true beauty of the introduction was that it would eat up the caller’s three free minutes and get us on our way to meeting the company’s 15-minute-per-call minimum.
"The picture reading shows me what goes on in the past life and in this life ... So if it shows me she was your guardian angel at one point, she was a guardian angel," she said. She added that the reading wasn't accurate because I had come in with the intention to trick, that the energy I came in with was one about my sister which is what she picked up on, that the whole thing wasn't very "civilized" of me and that she'd be calling other psychics and warning them about me. She told me she's been tested by people who declared their intentions and passed their tests, and offered to give me a reading that would reveal secrets about me that not even my closest friends know. I declined.
Physical mediumship is defined as manipulation of energies and energy systems by spirits. This type of mediumship is claimed to involve perceptible manifestations, such as loud raps and noises, voices, materialized objects, apports, materialized spirit bodies, or body parts such as hands, legs and feet. The medium is used as a source of power for such spirit manifestations. By some accounts, this was achieved by using the energy or ectoplasm released by a medium, see spirit photography. The last physical medium to be tested by a committee from Scientific American was Mina Crandon in 1924.
Many 19th century mediums were discovered to be engaged in fraud. While advocates of mediumship claim that their experiences are genuine, the Encyclopædia Britannica article on spiritualism notes in reference to a case in the 19th century that "...one by one, the Spiritualist mediums were discovered to be engaged in fraud, sometimes employing the techniques of stage magicians in their attempts to convince people of their clairvoyant powers." The article also notes that "the exposure of widespread fraud within the spiritualist movement severely damaged its reputation and pushed it to the fringes of society in the United States."