Full Idea
Evolution has proceeded in all other known species by increasingly complex configurations of molecules and organs, which support primitive psychologies; our human psychologies are more advanced, but undeniably continuous with lower animals.
Gist of Idea
In lower animals, psychology is continuous with chemistry, and humans are continuous with animals
Source
William Lycan (Consciousness [1987], 1.1)
Book Reference
Lycan,William G.: 'Consciousness' [MIT 1995], p.3
A Reaction
Personally I find the evolution objection to dualism highly persuasive. I don't see how anyone can take evolution seriously and be a dualist. If there is a dramatic ontological break at some point, a plausible reason would be needed for that.