Consciousness remains a metaphysical mystery. Scientists don't understand it, philosophers don't understand it, and neither does anybody else. Is everything in the universe fundamentally physical, or is there something more? Is the physicalist worldview incomplete? Why should first-person experience exist in the first place?
Dr. Emrys Westacott is a professor of philosophy at Alfred University. You can read his great introductory book here: http://amzn.to/242NO1B