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Since the classical investigations of Kraepelin and Bleuler, it has been customary to include among the more generally recognized characteristics of schizophrenia a disturbance in the attentive process, a disorder in adaptation, and a retreat from reality. These schizophrenic reaction patterns are intimately interrelated, since each is distinctly bound to the cognitive functions. The term "attention" is ambiguous in the literature, but the existence of some such factor and its central importance to behavior (both normal and psychopathological) have been adequately demonstrated. Thought and judgment, problem solving, perception, learning, memory—in fact, all intellectual behavior—not only have been found to be dependent upon attention but have been reduced by many investigators to the operation of this very fundamental and universally accepted aspect of behavior. Equally accepted is the knowledge that reality is mediated through these same cognitive processes and that the adaptational life pattern of an individual is determined by the