How Does The Science of Déjà vu Work?

Déjà vu is when you feel like you’ve already experienced something, even though it’s happening right now.

Imagine you're playing with your favorite toy, let's say it's a train set. You watch the little train go around the track, and suddenly, it feels familiar, like you've seen this exact moment before. That’s déjà vu!

Your brain has two parts that help you understand what's going on: one is fast, and the other is slower. The fast part notices things quickly, like when the train starts moving. The slow part takes a little more time to figure out what it just saw.

Sometimes, the slow part catches up after the fast part has already noticed something. It thinks, “Oh, I remember this!” even though you're seeing it for the first time. That’s why you feel like you’ve been here before, your brain is giving you a little surprise!

It's like when you’re halfway through eating a cookie and suddenly realize that you already ate one, but you didn’t! Your brain just tricked you into thinking it had.

That’s how déjà vu works, your brain is playing a fun little game with itself, making you feel like you’ve already lived this moment!