This textbook provides a comprehensive introduction to the emerging fields of neurolinguistics and linguistic aphasiology. Reflecting the dramatic changes that have taken place in the study of language disorders over the last decade, David Caplan's approach is firmly interdisciplinary. He introduces concepts from the main contributing disciplines - neurology, linguistics, psychology and speech pathology - in such a way that they will be clearly understood by all students, whatever their particular background. The topics covered have been carefully selected to demonstrate how the more sophisticated topical neurolinguistic approaches have developed from traditional clinical models. The critical and detailed discussion of all the main theoretical issues in the fields makes this a fundamental work not only for students but also for specialists.