What causes déjà vu and how does the brain process this phenomenon?

You get déjà vu when your brain thinks it’s seeing something new but actually remembers it from before, like when you walk into a room and feel like you've been there a million times.

Imagine you're playing with building blocks. You stack them up in a certain way, and then later, you see someone else do the exact same thing. Your brain goes, “Wait! I’ve seen that before!” That’s déjà vu, your brain is saying, “I know this, but it feels new!”

Your brain has two teams: one team sees something and remembers it right away. The other team takes a little longer to catch up. When they both say, “I remember that!” at different times, your brain gets confused, and boom, you feel like you’ve been somewhere before.

It’s like when you hear a song on the radio and think, “Wait, I know this tune!” but it takes a second for your brain to realize it's not a new song, it’s one you've heard before.

Sometimes, your brain is just playing a little trick on you. It's like when you put on a shirt that feels familiar, even though you haven’t worn it all day!