From several clinical cases, this book approaches different psychiatric tendencies with a didactic approach, and deepens in the knowledge of the daily exercise of professionists in this field. An important aspect of this book is that it systematically shows the link between practice and knowledge of biomedical research. Beyond French tradition, the book shows the historical evolution of notions used in neuroscience, and takes notice of the influences a psychiatrist integrates to better comprehension of theories and their application.