The inspiration to write this article was the internship I began in February in Max Planck Institute for Biological Cybernetics in Tübingen in Germany. It is a unique place where scientists from different fields work together to find out how the human brain is functioning. The main part of the team working in the Department of Cognitive and Computational Psychophysics, which I joined, are psychologists and computer scientists who with help of physical phenomena are examining the human perception system. For me as a physicist it is a very important experience, because I see how the Physics can be useful in other research fields.