A textbook on psycholinguistics. It contains some general chapters on signs and language (Bühler's model), the units of language, language and communication, some chapters on behaviorist theories of language, various chapters on theories and research aspects of meaning (including a discussion of Morris), some chapters on the psychological reality of transformational grammar, a chapter on child language, and a chapter on the relation of language and thought. The book is written from a functionalist point of view.