<a href="http://skepdic.com/truebeliever.html">True-believer syndrome</a> is an expression coined by M. Lamar Keene to describe an apparent cognitive disorder characterized by believing in the reality of paranormal or supernatural events after one has been presented overwhelming evidence that the event was fraudulently staged. <blockquote> A study done by psychologists Barry Singer and Victor Benassi at California State University at Long Beach illustrates the will to believe in psychic powers in the face of contrary evidence. They brought in a performing magician, Craig Reynolds, to do some tricks for four introductory psychology classes. Two of the classes were not told that he was a magician who would perform some amateur magic tricks. They were told that he was a graduate student who claimed to have psychic powers. In those classes, the psychology instructor explicitly stated that he didn't believe that the graduate student or anyone else has psychic abilities. In the other two classes the students were told that the magician was a magician. Singer and Benassi reported that about two-thirds of the students in both groups believed Craig was psychic. The researchers were surprised to find no significant difference between the "magic" and "psychic" classes. They then made the same presentation to two more classes who were explicitly told that Craig had no psychic abilities and that he was going to do some tricks for them whereby he pretends to read minds and demonstrate psychic powers. Nevertheless, more than half the students believed Craig was psychic after seeing his act. Singer and Benassi then asked the students whether they thought magicians could do exactly what Craig did. Most of the students agreed that magicians could. Then they asked the students if they would like to change their estimate of Craig's psychic abilities in light of the negative data they themselves had provided. A few did, reducing the percentage of students believing in Craig's psychic powers to 55 percent. Then the students were asked to estimate how many so-called psychics were really fakes using magician's tricks. The consensus was that most "psychics" are frauds. The students were again asked if they wished to change their estimate of Craig's psychic powers. Again, a few did, but the percentage believing in Craig's psychic powers was still a hefty 52 percent. </blockquote>