Well, I’d argue the whole brain is designed to keep us a live. We’re built to determine within a quick second whether we are attracted to someone, or fear them. Should we fear them we’ll most likely keep our senses open to that direction. Furthermore, our peripheral vision plays a huge role in keeping something insight without facing whatever it is. The hypothalamus also gets stirred up in this situation. If you’re afraid your alertness will definitely get your heart pounding, or if you’re sexually attracted you’ll become conscious of the staring and might like it, and therefore stay in the vicinity. The hypothalamus controls our initial emotional disbursements.