The scope of the book is rather large, and its purpose multifaceted. First, it is designed to summarize the contents of the symposium. In addition, it is designed to raise a number of important and at times controversial themes in modern-day thinking about the brain and its functions. That neuroscience has succeeded in trying to delineate the mechanisms involved in visual processing or memory, and even in psychiatric and neurological diseases, is impressive. But as these goals are increasingly met, the field has begun to approach the question of consciousness. Obviously, this is a more complex issue and requires us to consider, in addition to information related to mechanisms and neurophysiology, profound ethical, social, and medical issues. Our understanding of the brain has been driven by advances in technology and can be viewed in terms of an increasingly refined analogy: brain as wax writing tablet, brain as hydraulic system, brain as telegraph system, brain as computer. As Dr. Rose points out, however, to understand the brain we must directly study the brain. How to study such theoretical constructs as the relationship among brain, mind, and consciousness directly is the question raised and debated in this book.