of perceptual object stabilization, ca- gorization, emotional evaluation ¿ and retrieving all the above from memory inscriptions ¿ are the processes by which mental content is generated, and are, therefore, seen as prerequisites for thinking operations. In terms of a differentia specifica, the notion of ¿thinking¿ is seen as narrower than the notion of ¿cognition¿ and as wider than the notion of ¿reasoning¿. Thinking is, thus, seen as a subset of cognition processes; and reasoning processes are seen as a subset of thinking. Besides reasoning, the notion of thinking includes also nonexplicit, intuitive, and associative processes of linking mental content. According to this definition, thinking is not dependant on language, i. e. also many animals and certainly all mammals show early forms of thinking.