Human consciousness is invisible and impalpable; it seems to be an untraceable mystery. Throughout history, consciousness has always been a conundrum for scientists. The author of this book, Stanislas Dehaene, combines his cutting-edge achievements in experimental studies and consciousness research to describe how to study consciousness scientifically. He also discusses the applications of consciousness research, leading us to understand the creation and role of consciousness and providing insight into the development and challenges of neuroscience.