system
Given the following post, respond as if you're commenting on Reddit:
human
Do humans have the ability to "sense" when someone is behind them or staring at them or is it usually just a lucky guess?

I've always wondered... You'll be sitting somewhere like the library, then suddenly you look up and turn around and catch someone looking at you, or simply standing behind you. Can we naturally sense when someone's behind us or next to us or does it just depend on the situation?


EDIT: I suck... "I've always wondered," not "I've always wondering."
gpt
Obviously you can't tell what someone else's eyes are doing (the difference between them looking at you and not looking at you).  This is a great opportunity to consider bias!  When you look around and no one is looking at you, that doesn't stand out in your brain.  But when you "feel watched", look around, and someone IS watching you - think how amazing that is!  You have superpowers!  Your perception is paranormally good!  This gets remembered.

So due to bias, you have a tendency to have noticed all the times you "felt watched" and WERE, and a tendency not to notice/remember the times you weren't, thus you end up with a vague sense that you can somehow tell.