Deja vu is a very strange sensation. From what I gathered if you take it in the logical explanation or the definition most psychologists would also concur on is that its information being transmitted directly into long term storage and a bunch of other stuff that I don't remember.
A possible theory getting into discussion of linear time and alternate universes, etc. Suggests that for every action there is possibility of billions of other universes and maybe one choice you made in another reality could have lead you to be at a certain place earlier, so your other self in the other alternate timeline or dimension, universe, etc. has been there before. So lets say a house you were looking at buying or an item you see and get deja vu, your previous self had been here prior in another alternate reality and only now based on your other choice that you made in this reality has lead you to this point.
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