The first chapter of my thesis defines the key terms necessary for understanding the concept of mobility of companies in the private international law. The fundamental difference between lex societatis and the nationality of company are terms which are not identical, despite their frequent confusion. It is the lex societatis which is defining for the inner organisation of the company. According to the reasoning of the Court of European Union, in the cross border transfer of the statutory seat should inevitably lead to change of lex societatis. However, in order to decide on which legal order is applicable for defining the lex societatis of a company, we have to look into the international private rules of a particular country. There are two major theories from which stem the legal orders of all member countries, the real seat theory and incorporation theory. This chapter explores their pros and cons, as well as practical consequences of their application on the possibility of cross-border transfer of a seat of a company. The second chapter of my thesis outlines relevant European Union law which lies behind the concept of cross border mobility of companies. The Treaty provisions on freedom of establishment are reviewed in the light of the Court case law. The most relevant decisions of the Court are...

5 ABSTRACT Object permanence is a cognitive ability to perceive the continuous existence of objects, even if they cannot be directly observed, respectively perceived by other senses (Piaget 1954). In humans object permanence develops in 6 qualitatively different stages. By using a comparative approach, it was found that the last stage 6 of this ability also occurs in great apes, gibbons and some New World monkeys (capuchin, marmoset and tamarin). In this study, we conducted a study with a series of invisible displacements of an object, in which we investigated whether two rhesus macaques (Macaca mulatta) have fully developed the ability of object permanence and don't rely on simple alternative cognitive strategies, while solving the different tasks. With one test subject, we confirmed that he solved the tasks with stage 6 object permanence abilities. Although the second individual reached significant performance in some sessions, the overall results are ambiguous, because during the testing he had a tendency to use simple alternative strategies. Our study concludes that under certain circumstances macaques have the cognitive capacity for a fully developed ability of object permanence. Key words: Object permanence, rhesus macaque, invisible displacement, cognitive functions