Patricia Churchland recently gave a Gifford Lecture on Morality and the Mammalian Brain. It leaves me wondering what the argument is. Anyone who has read Midgley or Tallis (or a number of other philosophers and scientists) recognizes that human behavior, by definition, has a biological basis, but that biology is not the entire story. How does all of this information alter the way we pose moral questions, the way we reach moral judgements, or the moral judgements that we make? 

My answer is “not at all”.