These quotes are from Mind Games: Psychological Warfare in MMA, an article in issue 56 of Fighters Only magazine.
The psychologist quoted is Joe Bell:
"The best when it comes to the staredown is Fedor Emelianenko. Watch him: he does not make eye contact and his entire expression is extremely relaxed - you would think he is about to sit down for dinner or something.
"But here is the crucial thing. When the referee tells them to head back to their corners, Fedor suddenly darts a short look directly at his opponent - or through his opponent, I should say.
"This kind of look is associated with antisocial behavioural disorders and psychopaths. They don't look at you, they look through you. It's emotionless, it goes deeper than skin level.
"You will get a lot of fighters who will catch that look and suddenly realise they don't want to be there.