The Problem JLHE IMPORTANCE of sensory and motor function and the integrity of the entire neural apparatus for daily living is usually overlooked. However, even mild degrees of functional deficiency may unobtrusively, yet most assuredly, interfere with efficient living. Manifestly severe deficiencies in structure and impairment of function quite obviously present serious obstacles to optimal self-realization.The Baruch Committee on Physical Medicine, reporting in 1946, estimated that there were then in the United States 23,000,000 disabled persons, and in 1950 Linck placed the estimate at 28,000,000 (67). These estimates include the chronically ill and the aged. In 1943 the U. S. Public Health Service estimated that there were 16,000,000 disabled persons of working age, other than the institutionalized and those who were "essentially invalids." It is possible that these estimates are high, but even if the most conservative estimate that only 3 per cent of the population is disabled is correct, we have between four and five million in the United States (41). We are constrained by economic if not humane considerations to be concerned with the welfare of these persons.