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In addition to his original contribution to the problem of motility disorders in psychotic patients, Otto Kauders presents in this monograph a comprehensive review of the work of investigators responsible for the actual state of knowledge in this domain. The reader will find in this volume a thorough follow-up, in a necessarily condensed form, of the development of neuropsychiatric thought in regard to this problem. Wernicke, who coined the expression "psychomotor disturbances of the psychic arc-reflex," and Kleist, his closest follower as well as original investigator, represent the neurologic concept of psychomotility. In Wernicke's psychic arc-reflex, the latter does not differ fundamentally from any other primitive reflex, its passage through the psychic sphere being only an epiphenomenon. Kleist has enlarged greatly, on a descriptive level, Wernicke's work in studying the extreme polymorphism of hyperkinetic movements, in systematizing the concept of motility psychosis and in establishing the presence of typical motility