We've had a lot to say about altruism, and how economists and others have tried to study it. A group of economists at the University of Zurich now claims to have found a spot in the brain associated with altruistic behavior. From Pacific Standard:
It’s called the right temporoparietal junction (or TPJ for short). Along with many other crucial functions, this neural crossroads gives us the ability to understand the perspectives of others—a prerequisite for empathy.
Swiss scholars report they have found a strong connection between the TPJ and a person’s willingness to engage in selfless acts.