What causes Deja Vu?

In recent[when?] years, déjà vu has been subjected to serious psychological and neurophysiological research. Scientifically speaking, the most likely explanation of déjà vu is not that it is an act of "precognition" or "prophecy", but rather that it is an anomaly of memory; it is the impression that an experience is "being recalled".[citation needed] This explanation is substantiated by the fact that the sense of "recollection" at the time is strong in most cases, but that the 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 circumstance(s) they were "remembering" when they had the déjà vu experience. In particular, this may result from an 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). In other words, the events would be stored into memory before the conscious part of the brain even receives the information and processes it. This would explain why one is, if it ever comes to mind, powerless trying to twist the outcome of the event in order to create a paradox. The delay is only of a few milliseconds, and besides, already happened at the time the conscious of the individual is experiencing it. Another theory being explored is that of vision. As the theory suggests, one eye may record what is seen fractionally faster than the other, creating that "strong recollection" sensation upon the "same" scene being viewed milliseconds later by the opposite eye. However, this one fails to explain the phenomenon when other sensory inputs are involved, such as the auditive part, and especially the digital part. If one, for instance, experience déjà vu of someone slapping the fingers on his/her left hand, then the déjà vu feeling is certainly not due to his/her right hand to be late on the left one. Also, persons with only one eye still report experiencing déjà vu or déjà vecu. The global phenomenon must therefore be narrowed down to the brain itself (say, one hemisphere would be late compared to the other one).

I am not a doctor, but I have heard that the brain process the thought or image twice almost simultaniously and it seems as though you have experienced it before although it just happened.

OMGSH! I KNOW! When you find out, let me know!!!! Its been happening so much to me lately! Star for you! Answer mine, please. http://answers.yahoo.com/question/index?qid=20080515192745AAp5atx&pa=FYd1D2bwHTHzJbpvFO4zRypakoOvKGPKbOFaKLlQtUBPGw--&paid=asked&msgr_status=

Some say that it is your unconscious letting you be able to change what happens, to change fate.

omg, i dont know how it works but i want to. it happens to me ALL the time!!!!!!!