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The gaze heuristic is a heuristic employed by people when trying to catch a ball. Experimental studies have shown that people do not act as though they were solving a system of differential equations that describe the forces acting on the ball while it is in the air and then run to the place at which the ball is predicted to hit the ground. Instead they fixate the ball with their eyes and move so as to keep the angle of the gaze either constant or within a certain range. Moving in such a fashion assures that the ball will hit the catcher.