ELI5: What causes déjà vu?

Imagine your brain like a big library. It stores all your memories and experiences.

Sometimes, things get a little mixed up in the library.

• Déjà vu is that weird feeling when you feel like you've already experienced something, even if you know you haven't.

• Small Brain Hiccups: Sometimes, your brain might process information in a slightly different order. Imagine seeing a room. Usually, your brain takes in all the details one after another. But, maybe sometimes your brain takes in almost all the details at once. This might make you feel like you're remembering the room, even though you're seeing it for the first time.

• Memory Glitches: Think of it like a tiny glitch in your memory system. A new experience might accidentally get filed in your long-term memory instead of your short-term memory. This makes you feel like it's an old memory, even though it's happening right now.

• Brain Pathways: Your brain has different pathways for seeing things and remembering things. Sometimes, these pathways might get a little out of sync. This can create a sense of familiarity that isn't real.

• Similar Situations: Sometimes, a new situation might be very similar to something you've experienced before, even if you don't consciously remember it. This similarity triggers a feeling of déjà vu.