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- This article is about déjà vu, the psychological phenomenon.
- For the Crosby, Stills, Nash & Young album, see Déjà Vu (album).
- For the series of adventure games produced by ICOM Simulations (now Infinite Ventures, Inc.), see Deja Vu (video game).
The term déjà vu (French: "already seen", also called paramnesia) describes the experience of feeling that one has witnessed or experienced a new situation previously. The term was created by a French psychic researcher, Emile Boirac (1851-1917) in his book L' Avenir des Sciences Psychiques, which expanded upon an essay he wrote while an undergraduate French concentrator at the University of Chicago. The experience of déjà vu is usually accompanied by a compelling sense of familiarity, and also a sense of "eerieness" or "strangeness". The "previous" experience is most frequently attributed to a dream, although in some cases there is a firm sense that the experience "genuinely happened" in the past.
The experience of déjà vu seems to be very common; in formal studies 70% or more of the population report having experienced it at least once [1] (http://www.pni.org/books/deja_vu_info.html). References to the experience of déjà vu are also found in literature of the past, indicating it is not a new phenomenon.
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Scientific research
Déjà vu has been subjected in recent years to serious psychological and neurophysiological research. The most likely candidate for explanation, according to scientists in these fields, is that déjà vu is not an act of "precognition" or "prophecy" but is actually an anomaly of memory; it is the impression that an experience is "being recalled" which is false. This is substantiated to an extent by the fact that in most cases the sense of "recollection" at the time is strong, but any circumstances of the "previous" experience (when, where and how the earlier experience occurred) are quite uncertain. Likewise, as time passes, subjects can exhibit a strong recollection of having the "unsettling" experience of déjà vu itself, but little to no recollection of the specifics of the event(s) or circumstances they were "remembering" when they had the déjà vu experience, and in particular, this may result from a overlap between the neurological systems responsible for short-term memory (events which are perceived as being in the present) and those responsible for long-term memory (events which are perceived as being in the past).
Links with disorders
A clinical correlation has been found between the experience of déjà vu and disorders such as schizophrenia and anxiety, and the likelihood of the experience increases considerably with subjects having these conditions. However, the strongest pathological association of déjà vu is with temporal lobe epilepsy. This correlation has led some researchers to speculate that the experience of déjà vu is possibly a neurological anomaly related to improper electrical discharge in the brain. As most people suffer a mild (ie. non-pathological) epileptic episode regularly (eg. the sudden "jolt", a hypnagogic jerk, that frequently occurs just prior to falling asleep), it is conjectured that a similar (mild) neurological aberration occurs in the experience of déjà vu, resulting in an erroneous "memory".
Parapsychology
Déjà vu is popularly associated with precognition, clairvoyance or extra-sensory perceptions, and it is frequently cited as evidence for "psychic" abilities in the general population. Non-scientific explanations attribute the experience to a "prophecy" or "vision" (most commonly delivered via a dream), or alternatively to an experience had in a past life related to a reincarnation.
Similar phenomena
Other psychological phenomena have been labelled
- jamais vu (never seen, where the familiar is experienced as if never seen before) and
- presque vu (almost seen).
- Déjà vécu is the sense of already having lived through an experience.
- Also, déjà eprouvé, "already experienced".
Modern usage
Though still used for the true meaning as explained above, the term is also often used to sarcastically or ironically highlight something that somebody knows has happened before.
In the movie The Matrix, déjà vu is a sensible glitch in the Matrix that occurs when it is changed at the super-user level.
External links
- "The Tease of Memory" The Chronicle of Higher Education, July 23 2004 (http://chronicle.com/free/v50/i46/46a01201.htm)
- "Déjà Vu: If It All Seems Familiar, There May Be a Reason" New York Times, September 14, 2004 (http://www.nytimes.com/2004/09/14/science/14deja.html?ex=1252900800&en=331d6db9dff26282&ei=5090&partner=rssuserland)da:Deja-vu
de:Déjà-vu-Erlebnis el:Προμνησία es:Déjà vu he:דז'ה וו is:Déjà vu Déjà vu