This book discusses a particular aspect of brain function, that of storage and retrieval of memory of past experience, in terms of neuronal plasticity. In discussing this aspect of brain functions, however, it discusses brain mecha­ nisms in their wider sense as well. Clearly, the central nervous system is a highly interconnected system from all points of view, and it would not be possible to understand function in terms of only a single event or only a sin­ gle neurotransmitter. This is true for any biochemical activity that accompanies neuronal functional activity and accompanies behavior. The authors have commendably recognized this complexity, and recognize still more