Around the world societies are facing growing aging populations with the concomitant increase in neuropsychiatric disorders. Neuropsychiatric disorders are organic brain diseases with psychiatric symptoms, as in Alzheimer¿s and Parkinson¿s diseases, that cause cognitive impairment, including dementia, amnesic syndrome, and personality¿behavioral changes. As a clinical science, neuropsychiatry aims to explore the complex interrelationship between behavior and brain function from a variety of perspectives, including those of psychology, neurology, and psychiatry. This concise and updated monograph comprises the latest findings in the field and includes chapters on delusional symptoms, mood disorders and neurotic symptoms, cognitive impairment, behavioral and personality changes, and recently, cerebral alterations revealed in PTSD