QUOTE : The perceptive power of the brain in this undirected mode is so strong that it seems to border on a kind of telepathy. Test subjects can tell winning poker hands, for example, by watching two-second clips of professional players moving their chips to the center of the table to place a bet. Players with winning hands were almost imperceptibly smoother and looser in their body movements. (Their faces were unobservable in the study. A separate study found that facial expression—which is easy to mask—did not help observers judge the strength of a hand at all.) And the same is true of athletes: If you show basketball players a brief video of fellow players taking a free throw, roughly two-thirds of the time they can determine whether or not he will make the shot, based solely on the movement of the arm. There is something about grace that tells athletes what is about to happen. In short, quicker, more efficient movement gives small fighters an advantage over large ones, and unconscious perceptions allow them to see punches before they have been launched. Were either not true, larger fighters would regularly crush small ones, but they don't. This allows humans to confront or disobey the largest male in the group, which is a departure from millions of years of primate evolution.