Reduplicative paramnesia is a big, fancy name for something that happens when our brain gets a little confused about where we are. You know how sometimes you wake up in the morning and you forget where you are for a minute? This is kind of like that.
But instead of just being forgetful for a little bit, some people with reduplicative paramnesia might think that they're in two different places at the same time. It's like their brain gets mixed up and thinks that there are two identical copies of the same place.
Imagine that you have a really special toy that you love to play with in your bedroom at home. But then you go on a trip to your grandma's house and you bring that toy with you. You might start to feel like you have two different bedrooms that look exactly the same, with the same toy in both places.
That's kind of what it's like with reduplicative paramnesia. Some people might even think that there are two copies of themselves, or that they're living in two different realities at the same time.
It's a really interesting thing that happens in our brains, but it can also be kind of scary for the people who experience it. But doctors and scientists are working to understand why it happens and how to help people who have this condition feel more comfortable and secure in their surroundings.