What is the cause for (de' je-vous) or being familiar in a totally new place?

I read on Yahoo Health that Deja Vu might be caused by the brain's inability to distinguish between a very similar situation and the new one. For example, say you have had a lot of dogs in your life and you bought a new pink toy for one. Then the next dog you get you buy them a similar toy, maybe the same color or shape and you get the feeling you bought this exact toy for this exact dog once before. The situations are so similar that the brain cannot tell them apart giving you the sensation of already experiencing the situation.

Or you can go with the theory from the movie "Deja vu", lol. It was very interesting, far-fetched but interesting.
the occultic/spiritual realm.

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