Ultimately, a psychic reader should be evaluated and judged by what past customers are saying about them. Most online psychic networks display ratings and reviews on the profile page of each advisor they have inside their network. This allows you to weed through the low-quality readers and find a great psychic with high ratings and positive reviews.
In 1991, Wendy Grossman in the New Scientist criticized the parapsychologist Stephen E. Braude for ignoring evidence of fraud in mediumship. According to Grossman "[Braude] accuses sceptics of ignoring the evidence he believes is solid, but himself ignores evidence that does not suit him. If a medium was caught cheating on some occasions, he says, the rest of that medium's phenomena were still genuine." Grossman came to the conclusion that Braude did not do proper research on the subject and should study "the art of conjuring."
The Danish medium Einer Nielsen was investigated by a committee from the Kristiania University in Norway, 1922 and discovered in a séance that his ectoplasm was fake. In 1923 the Polish medium Jan Guzyk was exposed as a fraud in a series of séances in Sorbonne in Paris. Guzyk would use his elbows and legs to move objects around the room and touch the sitters. According to Max Dessoir the trick of Guzyk was to use his "foot for psychic touches and sounds".
The Polish medium Stanisława Tomczyk's levitation of a glass beaker was exposed and replicated in 1910 by the magician William S. Marriott by means of a hidden thread. The Italian medium Lucia Sordi was exposed in 1911, she was bound to a chair by psychical researchers but would free herself during her séances. The tricks of another Italian medium Linda Gazzera were revealed in the same year, she would release her hands and feet from control in her séances and use them. Gazzera would not permit anyone to search her before a séance sitting, as she concealed muslin and other objects in her hair.
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.
Maybe that's because I believe I've seen the real thing in a few people, one of whom I visit every few years. I won't go to her more than that because she gives so many specifics that it almost takes the fun out of life. She's told me I'm with one of my soulmates (which I found quite tolerable—this idea of several soulmates for each of us) and she's also said I'm an Indigo Crystal Child, which is her explanation for what makes me psychic.