[chrisf]

About 20 years of so ago, I read about some research being conducted into deja vu. simpley put (and if I remember correctly) it is a disruption of neural systems or something like that.

You experience something thru your senses, (sight, sound, even taste and smell) most commonly sight, and you brain first processes this input, and almost immediately it goes into short term memory, and then back to processing. It all happens almost instantaneously.

when you experience deja vu, there is a disruption or "short ciruit" and the experience goes first to the memory, and then onto processing. You are techically "remembering" something as your experience it. It can actually continue for long (relatively short) periods of time. I've actually had experiences that seem to have gone on for almost 15 or so seconds.