A séance ( /ˈseɪ.ɑːns/) is an attempt to communicate with spirits. The word "séance" comes from the French word for "seat," "session" or "sitting," from the Old French "seoir," "to sit." In French, the word's meaning is quite general: one may, for example, speak of "une séance de cinéma" ("a movie session"). In English, however, the word came to be used specifically for a meeting of people who are gathered to receive messages from spirits or to listen to a spirit medium discourse with or relay messages from spirits; many people, including skeptics and non-believers, treat it as a form of entertainment. In modern English usage, participants need not be seated while engaged in a séance.

One of the earliest books on the subject of communication amongst deceased persons was Communitation With the Other Side by George, First Baron Lyttelton, published in England in 1760. Among the notable spirits quoted in this volume are Peter the Great, Pericles, a "North-American Savage," William Penn, and Christina, Queen of Sweden. The popularity of séances grew dramatically with the founding of the religion of Spiritualism in the mid-nineteenth century. Perhaps the best-known series of séances conducted at that time were those of Mary Todd Lincoln who, grieving the loss of her son, organized Spiritualist séances in the White House, which were attended by her husband, President Abraham Lincoln, and other prominent members of society. The 1887 Seybert Commission report marred the credibility of Spiritualism at the height of its popularity by publishing exposures of fraud and showmanship among secular séance leaders. Modern séances continue to be a part of the religious services of Spiritualist, Spiritist, and Espiritismo churches today, where a greater emphasis is placed on spiritual values versus showmanship.

Richard Wiseman (born 1966) is Professor of the Public Understanding of Psychology at the University of Hertfordshire in the United Kingdom. Wiseman started his professional life as a magician, before graduating in Psychology from University College London and obtaining a Ph.D. in Psychology from the University of Edinburgh.

Wiseman is known for his critical examination and frequent debunking of unusual phenomena, including reports of paranormal phenomena. He is a fellow of the Committee for Skeptical Inquiry (CSI). His research has been published in numerous academic journals, reported at various conferences, and featured on television. In 2004, he took part in a preliminary test of Natasha Demkina, a young Russian woman who claims to have a special vision that allows her to see inside of people's bodies and diagnose illnesses. The test, whose validity has been disputed, was featured in the Discovery Channel documentary, The Girl with X-Ray Eyes.

In addition Wiseman has studied the principles of good and bad luck, publishing the results in the self-help book The Luck Factor. He showed that both good and bad luck result from measurable habits; for example, lucky people, by expecting good luck, might expend more effort in their endeavours, resulting in more success, reinforcing their belief in good luck. Lucky people are outgoing and observant and therefore have many more chance encounters than unlucky people, each of which could bring a lucky opportunity. Moreover lucky people are more likely to look on the bright side of 'bad' encounters. In a mental exercise describing being shot during a bank robbery, lucky people considered themselves lucky not to have been killed while unlucky people considered themselves unlucky to have been shot.