Hemisphere is concerned with categorization and symbolization and has often been called the dominant hemisphere.> However, it is dear that the other hemisphere is not simply less developed or "non dominant"; instead, it is specialized in the area of spatiotemporal relations.> It is this hemisphere that is concerned, for example, with the identification of objects by their form and the recognition of musical themes. It also plays a primary role in the recognition of faces.> Consequently, the concept of "cerebral dominance" and a dominant and non-dominant hemisphere has been replaced by a concept of complementary specialization of the hemispheres, one for sequential-analytic process (Categorical hemisphere) and one for visuospatial relations (the representational hemisphere).> Categorical hemisphere is concerned with language functions, but hemispheric specialization is also present in monkeys, so it antedates the evolution of languages">