The "neurosciences" is now a common 'term to describe several branches of the biology related to studies of the nervous system. In fact, this term also character- izes a multidisciplinary approach to studies of probably the most complicated system of the most complicated living organisms. Investigation of the central ner- vous system (CNS) is the most quickly developing branch of the neurosciences. According to Konorski's definition, the CNS "is endowed with two principal properties which are referred to as reactivity and plasticity. Reactivity of the sys- tem is its capacity to be activated...