material basis for consciousness
We've bounced this around here a bit. This neurologist was on Charlie Rose recently. He's made some amazing discoveries about the structure and functioning of the brain. His work centers around identifying the physical basis for certain types of awareness which aren't well understood. He seems to believe that eventually we will have a good understanding of the physical process that results in self-awareness and consciousness. He doesn't get very deep into that specific topic in this interview, but it is a pretty fascinating conversation, I thought.