system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is happening when we experience Deja Vu?

I have had many experiences where I was positive I had seen or experienced that exact moment before. I have also had very vague dreams that end up being very close to what happens in real life. What exactly is my brain doing when I experience these phenomenons?
gpt
It's because of the overlap in the regions of the brain that deal with memory. Instead of registering the initial event as a short-term memory, it registers as a long-term memory instead which is confusing to you because you know that it is recent event.