Published by Harvard University Press in 2005, Susan Clancy's book "Abducted: How People Come to Believe They Were Kidnapped By Aliens" was met with strong positive reviews. The book uses data derived from several memory studies on self described abductees that took place in the preceding few years. The book explores what mainstream experts believe to be the sources of abduction stories, such as sleep paralysis and the use of hypnosis techniques to "recover" forgotten memories. Clancy finds that previous interest in the paranormal and emotional investment also play a role in creating abduction memories.