It has been a while since I read Edelman's book. Edelman won the Nobel Prize in 1972 for important discoveries about the structure of antibodies, but he has devoted the last several decades to studying neuroscience. His two most well-known contributions are his theory of so-called 'neural Darwinism,' and his study of the importance of redundancy and feedback loops within the brain. He has written quite a few books on the subject including, Wider Than the Sky: The Phenomenal Gift of Consciousness (2005).
Second Nature is Edelman's attempt to address some of the philosophical issues about consciousness, while Wider than the Sky introduces some of his theories about how the brain generates consciousness.