The purpose of this paper is to bring to the attention of the psychologist the extensive research literature concerned with the physiological correlates of behavior. Research concerned with the electroencephalographic, histopathological, and biochemical analysis of schizophrenics receives concentrated attention. The review also includes "several psychological and physiological studies which focus specifically on the question of brain disorder in schizophrenia." The studies made within the last twenty to twenty-five years are in-cluded. 81-item bibliography.