In many areas of modern life rapid developments in science are overwhelming established norms. Brain biology, through DNA testing and advanced brain imaging techniques, has given medical scientists new insights into the functioning of the human mind. This erosion of long-standing beliefs has many implications for understanding and treating what society considers to be aberrant or immoral behavior. What medical science is indicating is that the focus of our emphasis on mental processes--particularly free will and intentionality--is shifting to recognition of the important role the physical...