Originally published in 1980, Cognition in Schizophrenia and Paranoia presents a theoretical framework that relates three fields of psychology: the experimental research in psychopathology, the developmental literature on intellectual growth, and the literature on hemispheric specialization. The specifications of the separate processes and their integration provides the means to reanalyze our empirical operations and theoretical terms in order to provide a more complete level of understanding, or at least alert us to additional possibilities in research strategies. Today it can be read in its historical context.