Discusses the various theories of consciousness from different perspectives: psychological, neurophysiological and philosophical. Theories regarding the interaction of pain, schizophrenia, the brain and the nervous system with consciousness are included. Also includes a discussion of the relative merits of the different theories together with the latest data from the experimental disciplines.About the Author: The Novartis Foundation is an international scientific and educational charity which promotes the study and general knowledge of science and in particular encourages international co-operation in scientific research.