Donald Olding Hebb (1904-1985) was, during his lifetime, an extraordinarily influential figure for discipline of psychology. His principled opposition to radical behaviourism and emphasis on understanding what goes on between stimulus and response (perception, learning, thinking) helped clear way for cognitive revolution. His view of as a biological science and his neuropsychological cell-assembly proposal rejuvenated interest in physiological psychology. Since his death, Hebb's seminal ideas exert an ever-growing influence on those interested in mind (cognitive science), brain (neuroscience), and how brains implement mind (cognitive neuroscience). Raised in Chester, Nova Scotia, Hebb graduated from Dalhousie University in 1925. He aspired to write novels, but chose more practical field of education and quickly became a school principal in Province of Quebec. The writings of James, Freud, and Watson stimulated his interest in psychology, and as a part-time graduate student at McGill University, Hebb was exposed to Pavlov's program. Unimpressed, Hebb was softened up for [his] encounter with Kohler's Gestalt Psychology and Lashley's critique of reflexology. Hebb went to work with Lashley, and in 1936 completed his PhD at Harvard on effects of early visual deprivation upon size and brightness perception in rat. He accepted Wilder Penfield's offer of a fellowship at Montreal Neurological Institute where he explored impact of brain injury and surgery, particularly lesions of frontal lobes, on human intelligence and behaviour. From his observations that removal of large amounts of tissue might have little impact on memory and intelligence, Hebb inferred a widely distributed neural substrate. At Queen's University, Hebb developed human and animal intelligence tests, including Hebb-Williams maze, which has subsequently been used to investigate intelligence of many different species in hundreds of studies (Brown & Stanford, 1997), making it Stanford-Binet of comparative intelligence. Hebb's studies of intelligence led him to conclusion that experience played a much greater role in determining intelligence than was typically assumed (Hebb, 1942). He would later point out that every bit of behaviour is jointly determined by heredity and environment, just as area of a field is jointly determined by its length and its width (Hebb, 1953). In 1942 Hebb rejoined Lashley, who had become director of Yerkes Laboratory of Primate Biology. There Hebb explored fear, anger, and other emotional processes in chimpanzee. Stimulated by intellectual climate at Yerkes Laboratory, Hebb began writing a book synthesizing different lines of research into a theory of-behavior that attempts to bridge gap between neurophysiology and psychology (Hebb, 1949, vii). Hebb returned to McGill as Professor of Psychology and in 1948 was appointed chair. His book, The Organization of Behavior: A Neuropsychological Theory, wielded a kind of magic in years after its appearance (Hebb, 1949). It attracted many brilliant scientists into psychology, made McGill University a North American mecca for scientists interested in brain mechanisms of behaviour, led to many important discoveries, and steered contemporary onto a more fruitful path. For Hebb the problem of understanding behavior is problem of understanding total action of nervous system, and vice versa (1949, p. xiv) and his advocacy of an interdisciplinary effort to solve this neuropsychological problem was his most general theme. When Hebb's book was published, physiological was in decline, and there was a growing movement in to reject physiological concepts (Skinner, 1938). The Organization of Behavior marked a turning point away from this trend. Metaphors, using non-biological devices with well-understood properties, figure prominently in history of attempts to explain behaviour and thought. …