I think all of us experienced such a situation. We are sitting in the train and suddenly the train begins to move, although it should stay on the station 10 minutes more. And then we realize, that our train doesn’t move, it was the train on the other platform. Haven’t you wondered then why did your brain make a mistake while analyzing the visual signals? The scientists working in the Department of Cognitive and Computational Psychophysics focus on the perception process of the human brain, especially how does it recognize objects and judge the distance to answer questions like the above one. Due to the fast development of computer graphics in last years they have in hands a very powerful tool, which allows them to create different kinds of virtual environments. Thank to these computer simulations self motion perception and orientation of human beings can be investigated. Moreover they have to their disposal building called Cyberneum with a lot of technical devices, like the KUKA robot arm or a linear treadmill, which can simulate the vestibular system.