Interesting new study that has some relevance to the discussion had with @Cornelius_Hunter and @Swamidass. Not that I want to get that whole thing going again. Really, I don’t, I think both sides showed grace and civility and the exchange ended laudably. But this does, nonetheless, show how a single point mutation changed how this gene was spliced and it had big consequences for the expansion of the neocortex.
Summary of study- http://neurosciencenews.com/neocortex-evolution-5715/