A 2004 psychological study involving 174 members of the Society for Psychical Research was interpreted as indicating that "individuals who reported a strong belief in the paranormal made more errors and displayed more delusional ideation than sceptical individuals".
A 2004 psychological study involving 174 members of the Society for Psychical Research completed a delusional ideation questionnaire and a deductive reasoning task. As predicted, the study showed that "individuals who reported a strong belief in the paranormal made more errors and displayed more delusional ideation than sceptical individuals".