This volume consists of 82 classic and important contributions to the basic neurobiology of learning and memory. Included are historical articles as well as articles on developmental plasticity, hormones and memory, long-term potentiation, electrophysiology of memory, biochemistry of memory, morphology of memory, invertebrate models, and features of animal and human memory. This is a companion volume to Brain Theory Reprint Volume in which articles on mathematical models of memory are presented.