Abstract: The study of age-related changes in cognitive processes is flourishing as never before, making the area an exciting one for a growing number of researchers. In addition, cognitive aging research is moving out from its traditional roots in experimental and developmental psychology -- creating increased contact with cognitive neuropsychology and cognitive neuroscience. To reflect these changes in the field, this volume includes chapters on abnormal aging, the neuroscience of aging, and applied cognitive psychology along with the core section on basic cognitive processes. While other recent compilations of research in this area have given relatively brief overviews of the literature, the contributors were given space to review each topic in depth, asked to evaluate the field -- not simply their own contributions -- and to provide critical commentaries from their personal perspectives. Couched most often in terms of cognitive or information-processing models, the general perspective of the contributors is a biologically-based account of aging. This shared viewpoint gives the volume particular coherence in its treatment of theories and data. Topics covered include age differences in attention, perception, memory, knowledge representation, reasoning, and language as well as their neuropsychological and neurological correlates and practical implications.