For this second edition of a detailed reference for professionals, researchers, and advanced students, Watts (neurology, U. of Alabama-Birmingham) and Koller (movement disorders, Mount Sinai Medical Center) place greater emphasis on the molecular bases of movement disorders, and have added new material reflecting recent research in areas such as genetic abnormalities that can cause familial parkinsonism, major advances in the treatment of Parkinson's disease, and the molecular genetics of inherited ataxias. Material is organized according to clinical patterns of disease expression, with sections on an introduction to movement disorders, neuroscientific foundations, and clinical disorders. Color and b&w medical images are included, and there is a list of patient support organizations.