This case is addressed in her book Braintrust: What Neuroscience Tells Us about Morality, which Shea describes as:
“…a bottom-up, biological story, but, in her telling, it also has implications for ethical theory. Morality turns out to be not a quest for overarching principles but rather a process and practice not very different from negotiating our way through day-to-day social life.”
Shea ends by suggesting that Churchland might have a long battle ahead of her to defend her ideas, but that Churchland’s “combative sensibility” will offer her an edge.
Read more here at The Chronicle: http://chronicle.com/article/The-Biology-of-Ethics/127789/