" The moment you’re part of a group, the amygdala tunes in to who’s in that group and starts intensely tracking them. Because these people are valuable to you. They were strangers before, but they’re on your team now, and that changes the whole dynamic. It’s such a powerful switch—it’s a big top-down change, a total reconfiguration of the entire motivational and decision-making system. "

― Daniel Coyle , The Culture Code: The Secrets of Highly Successful Groups