One of the leading indicators for behavior and intent is gaze direction. Many under cover detectives use this cue to figure out who may be predators in a crowd. In work for NBC Sports, Nils Krahnstoever has shown that we can track the gaze direction of football players providing a whole new level of sports analysis.
Spooky. Check it out.
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Battle not with monsters, lest ye become a monster. And if you gaze long into the abyss, the abyss also gazes into you. --F. Nietzsche
Babies as young as three months old will follow the eyes of an adult to look at the same thing the adult is looking at.
In face to face conversation, we often look away from the person we're speaking with. Somewhat paradoxically, the closer people sit to their conversation companions, the less often they look at them.