Title: The scientific reasons you can 'sense' when someone is watching you
Headings: 
Because your eyes pick up on more than you know.
Because you can think your way into feeling.
Because gaze is extremely important.
Because you often wrongly assume that you're being looked at …
… but that can actually be a good thing.

Content: Obviously, though, you don't. Which kind of makes a person wonder: What makes us feel like we're being watched, even when we can't see the watcher? And why, when we have that strange feeling, are we so often right? Because your eyes pick up on more than you know. When it comes to being stared at, like many other things we feel or know instinctually, our systems are detecting things far beyond our conscious gaze. Consider a 2013 case study of a patient identified as TN: He was cortically blind, meaning that his visual cortex was damaged such that he couldn't "see" in the traditional sense, but his brain still received input from his eyes. In this study, TN was shown pictures of faces, some that appeared to be looking straight at him, others looking off to the side. Though TN could not explain or articulate what he was seeing, activity in his amygdala — the part of the brain that responds to threat and arousal — spiked when he was shown pictures with faces that seemed to be staring at him.