The contributions in this book integrate knowledge on the structure, function, pathology and clinical manifestations of diseases of the basal ganglia. It comprises an edited version of selected presentations at a conference held on the subject which drew together basic scientists, pharmacologists, pathologists, neurologists, psychologists and psychiatrists from all over the world. The basal ganglia are considered by many to be the crossroads of neurology and psychiatry, and it becomes obvious through this book that understanding thereof will require extensive interdisciplinary collaboration. Research and interest in this part of the brain have been stimulated over recent years by discoveries about the role of subcortical regions in cognitive functions, and the developments of effective treatment for Parkinson's disease. This book thus draws together recent advances and provides an agenda for future research.