system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How does it come we notice when we get direct eye contact with another person?

There is something that makes you know when you have that direct eye contact with a person, even though they might stand meters away from you and you are surrounded by other people too.

What makes you know when you have that eye contact? Because even if there is someone that is standing almost right behind me I know when someone that is standing let’s say 6 meters away is looking at the other person or when they are looking at me.
gpt
Eye contact was very important for our ancestors, to find potential mates or threats. Because of this our brains developed a "super power" when it comes to eye contact, reading the miniscule changes in the eyes that indicate we've made contact. Note that this system is hyper sensitive so it can trigger a lot of false positives (thinking there's eye contact when there's not).