The secret of the successful use of the ouija board. Following its commercial introduction in 1890,the Ouija board was regarded as a harmless parlor game unrelated to the occult until American Spiritualist Pearl Curran popularized its use as a divining tool during World War I.
While Ouija believers feel the paranormal or supernatural is responsible for Ouija's action, or by unconscious
movements of those controlling the pointer, a psychophysiological phenomenon known as the ideomotor effect. Despite being repeatedly debunked by the efforts of the scientific community and denounced as a tool of Satan by conservative Christians, Ouija remains popular among many people.