To socialize, your brain needs to see and hear other people, yet your brain is sealed inside a bony box: your skull. How does an internal mass of tissue comprehend the world outside? How does it form social relationships? This groundbreaking book answers those questions and reveals the perceptual underpinnings of society. Charles and Daphne Maurer provide a clear explanation of how the brain interprets sensory inputs, showing how rudimentary sensations evolve into social interactions at every scale from nursery to nation. Their novel approach shows how sights, sounds, and smells build social and political worlds. They offer fresh insights into broad swaths of the social sciences. The World Inside Your Head brings science to life, interweaving cutting-edge research with eye-opening examples across cultures and eras. Its style is lively and free of jargon, yet its argument is rigorous and scholarly. It is an accessible and iconoclastic rethinking of conventional psychology.