The human psyche is still an unsolved mystery. Modern psychiatry is closely linked to neuroscience and explores how the world around us affects the brain and how the brains of people with mental disorders function in this world. In this book, we will look in detail at the most common, but at the same time very controversial disorders, the causes of which even now have not been fully studied. — Why does the discovery of the nature of schizophrenia occur in parallel with the development of brain science? — Why is depression a really serious disease that is worth paying close attention to? — Why is a formed addiction actually a damage to the system of neural connections in the brain? — Is dementia only a sign of an aging organism? In the logic of psychiatric research, one of the most intriguing moments is the plot of bringing to the fore a specific organ, a material object located inside the cranium - the brain. Our research is the story of how mental disorders became brain disorders, and psychiatry has transformed from a marginal science into a full-fledged medical discipline.