>But the trait that ALL domesticated species demonstrate relative to their wild species is a smaller brain. I’d bet it’s happening with humans, too, but that’s just an observation for another day.
Associating brain size with intelligence is facile. As the article points out, no one knows why cranial volume is shrinking, and there's no clear connection to intellect.
It is: http://discovermagazine.com/2010/sep/25-modern-humans-smart-...