| Abstract | [Introduction]
Since speech production and perception appear to be almost exclusively human capacities, we are somewhat limited in our ability to examine their several substrata experimentally. Consequently, it has been common practice to try to discover the function of various parts of the system by examining pathological cases. These studies can be divided into two rough classes which we might call disability-oriented and normal function-oriented. Some workers are interested in diagnosis, prognosis and treatment problems; others are interested in what the study of the abnormal can tell us about normal language function. For some reason, although there have been studies of general language function which fall into both classes, studies of pathological phoneme production are generally directed towards treatment. We might be able to gain considerable insight into the function of various parts of the nervous system in controlling articulation, if we used clinical material on damage at different levels and sites in the sensorimotor system. This would be a large undertaking; in this paper we will only discuss some preliminary results on a special population, in particular, disordered articulation in patients with cortical damage, and, for comparison, in a population of patients with profound sensori-neural hearing loss. |