system
Given the following post, respond as if you're commenting on Reddit:
human
How does your brain know which of your memories are real and which aren’t?

I’m laying in bed and just woke up from a dream where I placed an order for a new dining table. After I woke up from my dream it took a little bit of time for me to realize that I never actually ordered that dining table. How does my brain know my “dream memory” of me ordering that table didn’t actually happen?
gpt
The line between real and fictional memories isn't that clear. Eyewitnesses for example can remember things that aren't true. Every time you remember something you change this memory a little bit. And you can even create false memories by asking questions like: "Do you remember ... we did last summer? Here's a (photoshopped) image." But usually it is possible to detect false memories by searching the context for inconsistencies (e.g. teleportation in dreams).