Often described as the opposite of deja vu, jamais vu involves a sense of eeriness and the observer's impression of experiencing something for the first time, despite rationally knowing they've experienced it before. Jamais vu is sometimes associated with certain types of aphasia , amnesia, and epilespy.
Jamais vu is most commonly experienced when a person momentarily does not recognise a word or, less commonly, a person or place, that they know. This can be achieved by anyone by repeatedly writing or saying a specific word out loud . After a few seconds one will often, despite knowing that it is a real word, feel as if "there's no way it is an actual word".
The phenomenon is often grouped with deja vu and presque vu (tip of the tongue, literally "almost seen").
Theoretically, a jamais vu feeling in a sufferer of a delirious disorder or intoxication could result in a delirious explanation of it, such as in Capgras delusion , in which the patient takes a person they know for a false double or impostor. If the impostor is the sufferer themselves, the clinical setting would be the same as the one described as depersonalization ; hence, jamais vus of oneself, or of the very "reality of reality", are termed depersonalization and derealization , respectively.
A study by Chris moulin of Leeds University asked 92 volunteers to write out "door" 30 times in 60 seconds. In July 2006 at the 4th International Conference on Memory in Sydney he reported that 68 percent of volunteers showed symptoms of jamais vu, such as beginning to doubt that "door" was a real word. Dr Moulin believes that a similar brain fatigue underlies a phenomenon observed in some schizophrenia patients: that a familiar person has been replaced by an impostor. Dr Moulin suggests they could be suffering from chronic jamais vu.
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