Integrating literatures from all areas of psychology, this text includes historical accounts, analysis of experiments, and treatment of topics from free-association and hypnosis to truth sera, to provide a comprehensive scientific account of memory increasing over time. This volume highlights both classic and modern work on hypermnesia, or memory improvement. Included are Erdelyi's own contributions, ranging from his early attempts to use free-association to produce hypermnesia to his most recent research with hypnosis, subliminal stimuli, forced-recall techniques, and very long-delayed recall probes.