What is Deja Vu????

Déjà vu is the feeling that one has lived through the present situation before.This is a French phrase that translates literally as "already seen". Although some interpret déjà vu in a paranormal context,mainstream scientific approaches reject the explanation of déjà vu as "precognition" or "prophecy". It is an anomaly of memory whereby, despite the strong sense of recollection, the time, place, and practical context of the "previous" experience are uncertain or believed to be impossible.Two types of déjà vu are recognized: the pathological déjà vu usually associated with epilepsy or that which, when unusually prolonged or frequent, or associated with other symptoms such as hallucinations, may be an indicator of neurological or psychiatric illness and the non-pathological type characteristic of healthy people, about two-thirds of whom have had déjà vu experiences. People who travel often or frequently watch movies are more likely to experience déjà vu than others. Furthermore, people also tend to experience déjà vu more in fragile conditions or under high pressure, and research shows that the experience of déjà vu also decreases with age.

 

Medical disorders

Déjà vu is associated with temporal lobe epilepsy.[medical citation needed] This experience is a neurological anomaly related to epileptic electrical discharge in the brain, creating a strong sensation that an event or experience currently being experienced has already been experienced in the past.

Migraines with aura are also associated with deja vu.

Early researchers[when?] tried to establish a link between déjà vu and mental disorders such as anxiety, dissociative identity disorder and schizophrenia but failed to find correlations of any diagnostic value. No special association has been found between déjà vu and schizophrenia. A 2008 study found that déjà vu experiences are unlikely to be pathological dissociative experiences.[medical citation needed]

Some research has looked into genetics when considering déjà vu. Although there is not currently a gene associated with déjà vu, the LGII gene on chromosome 10 is being studied for a possible link. Certain forms of the gene are associated with a mild form of epilepsy, and, though by no means a certainty, déjà vu, along with jamais vu, occurs often enough during seizures (such as simple partial seizures) that researchers have reason to suspect a link.

Source:WIKI