In the introduction to this book, Larry Squire, Ph.D., points out that the first book called Mechanisms of Memory, by the neuroscientist E. Roy John, was published in 1967 R16211CHDIFGFB. Squire highlights the considerable progress that has been made in understanding memory systems, including a host of new tools, ideas, and discoveries, by comparing the foundation from which Dr. John wrote with the state of the field in the 2000s. Dr. John’s book was based on localization of function, information provided by assemblies of neurons, and electrophysiological correlates of learning and memory. The current volume is based on the development of animal model systems for studying the genetics and synaptic changes underlying behavioral memory, the discovery of long-term potentiation, the concept of multiple memory systems, and delineation of both cellular and molecular contributions to neural plasticity.