Historical Issues in the Study of Behavioral Dysfunction in Movement Disorders

The interface between behavioral and motor function is a characteristic of all movement disorders and has long been appreciated. The historical study of this interface gathers the names and works of several neurological luminaries from the 19th and 20th centuries. This chapter focuses on one hypokinetic disorder, Parkinson’s disease (PD), and one hyperkinetic disorder, Huntington’s disease (HD). As a historical essay, the chapter presents the background for contemporary topics discussed elsewhere in this volume.