What is consciousness?

Abstract

Human consciousness is one of the greatest mysteries in the universe. From one point of view this should be surprising, since we know a great deal about consciousness from our own experience. One could say that our own conscious experience is the thing in the world that we know best. Descartes wanted to build the entirety of natural science on the foundation of our understanding of our conscious thought. Yet despite our intimate relationship with our own consciousness experience, from another point of view consciousness is a puzzling phenomenon. We have no idea what it is about us, as physical beings, that makes us conscious, why we have consciousness, or which creatures other than humans have consciousness. Not only is it hard to answer these questions, it is hard to know how to even start to find answers.