Here are some sections from that article"NEED TO BELONG'
Both kinds of rewards triggered activity in a reward-related area of the brain. Sadato said the finding represents an important first step toward explaining complex human social behaviors such as altruism."
The article acknowledges the existence of biologically coded reward system in brain."The fact that the social reward is biologically coded suggests that "the need to belong ... is essential for humans," said Sadato, whose study appears in the journal Neuron."
The following pssage shows that human brain uses same parts of brain to process and react to different social and environmental inputs and stimuli.
"A similar study in the same journal by Caroline Zink of the National Institute of Mental Health and colleagues found the same brain region was active when people were processing information about social status."
The complete Reuters news article is at.