The Tricky Business of Measuring Consciousness

The only thing you know for sure is that you are conscious. All else is inference, however reasonable. There is something in your head that generates experiences: the words you are reading on this page, the snore of a bulldog on a red carpet, the perfume of roses on a desk. Your experience of such a scene is exclusive to you, and your impressions are integrated into one unified field of perception. It is like something to be you reading, hearing a dog, smelling flowers.