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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. The fantasies may include dissociation and sexual fantasies. 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.
(1) Parents or carers who provided a very structured and imaginative mental or play environment during childhood. People with fantasy prone personalities are more likely to have had parents, or close family members that made their inanimate toys as children seem real. They also encourage the child who believes they have imaginary companions, read fairytales all through childhood and re-enact the things they have read. People who, at a young age, were involved in creative fantasy activities like piano, ballet, and drawing are more likely to obtain a fantasy prone personality. Acting is also a way for children to identify as different people and characters which can make the child prone to fantasy-like dreams as they grow up. This can cause the person to grow up thinking they have experienced certain things and they can visualize a certain occurrence from the training they obtained while being involved in plays.
People have reported that they believed their dolls and stuffed animals were living creatures and that their parents encouraged them to indulge in their fantasies and daydreams. For example, one subject in Barrett’s study said her parents’ formula response to her requests for expensive toys was, “You could take this (household object) and with a little imagination, it would look just like (an expensive gift).”
(2) Exposure to abuse, physical or sexual, such that fantasizing provides a coping or escape mechanism.
(3) Exposure to severe loneliness and isolation, such that fantasizing provides a coping or escape mechanism from the boredom.
Regarding psychoanalytic interpretations, Sigmund Freud has stated that "unsatisfied wishes are the driving power behind fantasies, every separate fantasy contains the fulfillment of a wish, and unproves an unsatisfactory reality." This shows childhood abuse and loneliness can result in people creating a fantasy world of happiness in order to fill the void.
Openness to experience is one of the domains that are used to describe human personality in the Five Factor Model. Openness involves six facets, or dimensions, including active imagination (fantasy), aesthetic sensitivity, attentiveness to inner feelings, preference for variety, and intellectual curiosity. Thus, fantasy prone personality correlates with the fantasy facet of the broader personality trait Openness to Experience.
Absorption is a disposition or personality trait in which a person becomes absorbed in his or her mental imagery, particularly fantasy. The original research on absorption was by American psychologist Auke Tellegen. Roche reports that fantasy proneness and absorption are highly correlated. Fantasizers become absorbed within their vivid and realistic mental imagery.
Dissociation is a psychological process involving alterations in personal identity or sense of self. These alterations can include: a sense that one's self or the world is unreal (derealization and depersonalization); a loss of memory (amnesia); forgetting one's identity or assuming a new self (fugue); and fragmentation of identity or self into separate streams of consciousness (dissociative identity disorder, formerly termed multiple personality disorder). Dissociation is measured most often by the Dissociative Experiences Scale. Several studies have reported that dissociation and fantasy proneness are highly correlated. This suggests the possibility that the dissociated selves are merely fantasies, for example, being a coping response to trauma. However, a lengthy review of the evidence concludes that there is strong empirical support for the hypothesis that dissociation is caused primarily and directly by exposure to trauma, and that fantasy is of secondary importance.
False pregnancy (pseudocyesis). A surprisingly high number of female fantasizers - 60% of the women asked in the Wilson-Barber study - reported that they have had a false pregnancy (pseudocyesis) at least once. They believed that they were pregnant, and they had many of the symptoms. In addition to amenorrhea (stoppage of menstruation), they typically experienced at least four of the following: breast changes, abdominal enlargement, morning sickness, cravings, and "fetal" movements. Two of the subjects went for abortions, following which they were told that no fetus had been found. All of the other false pregnancies terminated quickly when negative results were received from pregnancy tests.
Maladaptive daydreaming.  A 2011 study reports on 90 excessive, compulsive or maladaptive fantasizers who engaged in extensive periods of highly-structured immersive imaginative experiences. They often reported distress stemming from three factors: difficulty in controlling their fantasies that seemed overwhelming; concern that the fantasies interfered in their personal relationships; and intense shame and exhaustive efforts to keep this "abnormal" behaviour hidden from others.
Parapsychology (Paranormal experiences). The pioneer Wilson-Barber study  states that fantasy prone personality is a key to understanding reputed paranormal (parapsychological) experiences, such as extrasensory perception (ESP).