Much of the intellectual history of psychology as both a scientific and a clinical enterprise has involved the attempt to come to grips with these two problems of mind and body. Through this exhibit and in the discussion to follow, we will trace this history as we identify major contributions to theories of mind, body and their relationship. Starting with Descartes, whose formulation of the problem has in one way or another affected all later views, we will note the way in which 17th and 18th century ideas developed in direct response to the Cartesian challenge, and then relate 19th century mind/brain theorizing to progress in understanding the brain as the "organ of mind" and the mind as a powerful source of physical illness and cure.
With this as background, we will outline the rise of experimental psychology as it occurred at the interface between philosophical analyses of the mind/world relationship and physiological conceptions of the nervous system as a sensory-motor device mediating between the mind and the world. In this regard, we will focus not only on European but on early and often overlooked American contributions. We will conclude with a brief discussion of some of the most important influences on the thought of William James, whose Principles of Psychology (1890) gathered all of these various threads together in what is probably the greatest single work in psychology.