Human consciousness is one of the most fascinating mysteries sheltered by the brain, evidencing that what happens between our ears is more important than what happens outside our skull. In addition, how do we know whether someone other than ourselves is conscious? This book offers a compelling bioethical analysis of one of the most intriguing topics of neuroscience: states of consciousness. It brings together the thought-provoking contributions of international experts concerning the role of bioethics in fostering dialogue between different, but related, fields of study concerning human consciousness and its altered states, including ethics of neuroscience, psychology, philosophy and anthropology, theology, clinical ethics, law and social studies.