This chapter analysis the relationship between the functional structure of the brain and experience as inferred from behavior which has led from Henri Bergson's philosophical intuitions to current scientific intellectual understanding. This process of analysis has provided us with the beginnings of an understanding of consciousness as state, process, and content; of the distinction between referential time and experienced duration, and even what might be meant by intuition. In keeping with the Zeitgeist of the nineteenth and early twentieth century's, Bergson was convinced that understanding the mental and spiritual nature of mankind depended to a large extent on understanding the relationship between man's conscious experience and his brain. What puzzled the intellects of the nineteenth century was that experience, introspectively analyzed, had so little in common with the physical and biological processes which contemporary science was then describing.