Psychiatric disorders in epilepsy are common but are often not properly recognized and treated. Additionally, EEG abnormalities are frequently found in psychiatry, the significance of which remains unclear. This book summarizes the current state of knowledge regarding diagnosis, theory, and therapy in these areas. It develops models for understanding psychiatric disorders in the context of neural network instability, allowing for an integrative perspective on these phenomena at the intersection of neurology, epileptology, psychiatry, and psychotherapy.