A case of 1 + 1 = more than 2. (?)
Or are you more concerned with "The Ghost in the Machine," lovingly (ok, not lovingly) sprouted and developed from Descartes' concept of mild/body dualism. Sort of; it's come a long way.
Coming to a bookstore near you (March, 2007):
I am a Strange Loop by Douglas R. Hofstadter. He's the mind behind the classic,
Godel, Escher, Bach: An Eternal Golden Braid.