Three games were chosen for the experiment. The subjects played each with both a mouse and then again with eye tracking software.
Orientation in a FPS was tested using Jake 2, a Java port of Quake 2. Players had to work their way down a hall and through a door, taking down five enemies with a pistol and unlimited ammo. One problem with using the eyes, researchers found, was The average completion time was 40 seconds for eye trackers, but only 30 seconds when a mouse was used. Survey data suggests the subject's overwhelmingly felt the mouse was easier to use and preferred its use in the future.