Dementia is one of the most pressing problems that currently faces planners and providers of health care today. This has resulted in an explosion in research activity with the consequent growth of knowledge about all aspects of dementia and in particular about Alzheimer's disease. This book summarizes current knowledge of the neuropsychology of dementia, highlights the multifaceted nature of the problem, and argues that an input from neuropsychologists can facilitate the advances made by other neuroscientists investigating dementia. The book shows that the study of dementia has caused something of a paradigm shift within neuropsychology itself as a scientific discipline.