Twenty essays support and amplify the pioneering neuroevolutionary psychobiology of Paul MacLean, whose concepts of the triune brain and limbic system helped link brain science, social theory, and moral consciousness. The multidisciplinary essays, from the proceedings of a symposium held in Boston in July 1999, highlight modern theoretical convergences with MacLean's theories at a time when his work has been marginalized by mainstream brain science. A brief sampling of topics: deep time and the brain the message of the molecules, MacLean's paradigm and its relevance for psychiatry's basic science, and the human brain as the linkage between macro and micro level political phenomena. Annotation c. Book News, Inc., Portland, OR (booknews.com)