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It's a primal instinct...Predator/prey thing...It's a protective mechanism
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I'd tend to lean somewhat towards this direction too.
You can "see/observe" things in your peripheral vision that you might not immediately take into account, if you're being stared at/watched you'd more than likely pick not only this up, but the body language behind it, the glances away when you try to confirm whether or not they're doing it.
I wouldn't call it so much sensing it as seeing it - sure, your body is giving you some primal type messages on account of your (in most cases) peripheral input, but it's still just another way to see things that you might not directly notice.
My say.