THis was how deja vu was explained to me... i could be wrong but i dont think so.

When one experiences something for the first time it is sent to short term memory first, to be later sent to long term memory at the appropriate time. When one experiences deja vu what happens instead is the new memory is sent to long term memory instead so if you try to compare what you are experiencing to your past you suddenly feel like you have done that exact same thing before.

Again this is just how it was explained to me. There could be other causes, that im not aware of.

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They call 'em fingers, but i've never seen em fing..... oh there they go!! otto