On the first question, the same mechanism could be at work in the kind of deja vu you describe. Basically, you have the initial sights and sounds that lead you to think you have seen this before. You then get the overwhelming sense that you have seen this all before, and you use those initial sights and sounds as the "proof" that you had seen them before. So, these memories feed back on themselves to strengthen the sense that you have done this all before.

There are lots of individual differences in how likely people are to experience deja vu. Younger people are more likely to experience it than older people. People who report having lots of vivid dreams also report having more deja vu experiences than people who do not report dreaming a lot.

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