The disorders which are classified as organic brain diseases and which show psychiatric symptoms are known as neuropsychiatric disorders. They can cause cognitive impairment such as personality-behavioral changes, dementia and amnesic syndrome. These are studied within the field of neuropsychiatry, which in turn falls under the umbrella of psychiatry. The study of the complex interrelationship between brain function and behavior through the viewpoints of psychiatry, neurology and psychology is undertaken under this field. Advances in the study of neuropsychiatric disorders helps in the improvement of diagnosis, facilitates the development of new and more efficient interventions, and assists in treatment selection. This book contains some path-breaking studies in the field of neuropsychiatric disorders. It consists of contributions made by international experts. As the research in this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and aspects of the subject.