Not by any “supernatural” means. But the brain can pick up subtle clues that there is somebody nearby that, individually, do not make it through the pipeline to our alert-presence cortex, but can “simmer” a bit in the depth of the brain and then in sum generate a conscious feeling that there might be somebody nearby. This can be subtle sounds, even breathing, or rustles of clothes, or the smell of a person, things like that.
And our primordial prey-brain will then start to think that there might be a predator nearby watching us. Which is why we identify the feeling of it the way we do.
Disclaimer: this is my “informed” opinion based on a general science background, I am not a behavior expert nor have I read anything specific about this.
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