The problem is in real life you dont move as they do in the game, you have more awareness of your suroundings in real life because of your other senses. In a game your scenses are limited by the program, so all you have is limited visual and selective sound. And in real life your peripheral vision adjusts to the surrounding for when your turning, to slowly bring things into focus for you. In the games its automatically in focus even though your staring straigh ahead, causing a disalusion of where you are. In your perception your looking straight ahead. But your brain cant tell which area your trying to focus on.