Full Idea
In physicalism the "ghost in the machine" is merely replaced by the "complexity" in it.
Gist of Idea
Physicalism offers something called "complexity" instead of mental substance
Source
Georges Rey (Contemporary Philosophy of Mind [1997], Int.2)
Book Reference
Rey,Georges: 'Contemporary Philosophy of Mind' [Blackwell 1997], p.6
A Reaction
This is nonsense. No one thinks that mere complexity generates consciousness. The assumption is that we would begin to understand the mind only if we could somehow map the connections of the brain.