Fantasy prone personality (FPP) is a disposition or personality trait in which a person experiences a lifelong extensive and deep involvement in fantasy. This disposition is an attempt, at least in part, to better describe "overactive imagination" or "living in a dream world". An individual with this trait (termed a fantasizer) may have difficulty differentiating between fantasy and reality and may experience hallucinations, as well as self-suggested psychosomatic symptoms. Closely related psychological constructs include daydreaming, absorption and eidetic memory.
American psychologists Sheryl C. Wilson and Theodore X. Barber first identified FPP in 1981, said to apply to about 4% of the population. Besides identifying this trait, Wilson and Barber reported a number of childhood antecedents that likely laid the foundation for fantasy proneness in later life, such as, "a parent, grandparent, teacher, or friend who encouraged the reading of fairy tales, reinforced the child's ... fantasies, and treated the child's dolls and stuffed animals in ways that encouraged the child to believe that they were alive." They suggested that this trait was almost synonymous with those who responded dramatically to hypnotic induction, that is, "high hypnotizables." The first systematic studies were conducted in the 1980s by psychologists Judith Rhue and Steven Jay Lynn. Later research in the 1990s by Deirdre Barrett at Harvard confirmed most of these characteristics of fantasy prone people, but she also identified another set of highly hypnotizable subjects who had had traumatic childhoods and who identified fantasy time mainly by "spacing out."
A fantasy prone person is reported to spend a large portion of their time fantasizing, have vividly intense fantasies, have paranormal experiences, and have intense religious experiences. People with FPP are reported to spend over half of their time awake fantasizing or daydreaming and will often confuse or mix their fantasies with their real memories. They also report out-of-body experiences.