In this volume the authors combine two clinically-oriented approaches to language disorder. The clinical aspects of aphasia syndromes are stressed but the authors also review assessment techniques, linguistic analyses, problems of aphasia classification, and frequently occuring related disorders such as alexia, agraphia and acalculia. In addition, commonly encountered speech disorders, neurobehavioral and psychiatric problems commonly associated with apasia, and the language characteristics of aging and dementia reviewed. A neural basis is proposed for aphasia and related problems. Finally, aspects of rehabilitation and recovery are presented.