Doctors don't know what causes déjà vu, but here's what they think is happening when you get that feeling:
Your brain can juggle more than two conscious tasks at once.Your brain doesn't really do several tasks at once when you multi-task. It switches very quickly from one task to another. Because switching takes time, multi-tasking isn't a very effective or efficient way to work.
For a moment, they mistakenly think they were there or did it in the past.The bigger your brain is, the smarter you are.A bigger brain doesn't always mean bigger thoughts. In fact, human brains were larger back when we were living in caves, but our bodies were also larger then. As we evolved, more of the space in our brains became used for complex processes such as language, thinking, and memory.
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