Although thought and problem solving have a sequential character when viewed over a time frame of minutes or hours, the authors argue that each step in the sequence is the result of the simultaneous activity of a large number of simple computational elements, each influencing others and being influenced by them. "Parallel Distributed Processing" describes their work in developing a theoretical framework for describing this parallel distributed processing activity and in applying the framework to the development of models of aspects of perception, memory, language, and thought.
Volume 1 lays the theoretical foundations of parallel distributed processing. It introduces the approach and the reasons why the authors feel it is a fruitful one, describes several models of basic mechanisms with wide applicability to different problems, and presents a number of specific technical analyses of different aspects of parallel distributed models.