Reviews roots from which Halstead began his investigations, significance of his original collaboration with neurological surgeons, and long-term implications of his practical approach of observing brain-damaged patients in their everyday living situations to identify problems and limitations they experienced. Describes development of…

Describes the interdisciplinary research of Myrtle B. McGraw; examines the controversy about McGraw's concept of critical period; and assesses her impact on current research. McGraw contended that the overlapping phases involved in neuromuscular integration demonstrate that learning and maturation interact during development. (BC)