Hebb's model is the theoretical view of the central nervous system as a self-organizing neurological machine composed of cell assemblies that determine behavior as they grow from experience. This is similar to an early idea of Freud that mental functioning might be explained by thinking of it as coming from a neurological machine that runs itself.

Stein would like a psychoanalytic theory that explains all psychological phenomena. He is not satisfied either with Freud's system of constructs which define