But normally we are social. Why do we have these social tendencies? Are these cooperative tendencies a form of self-interest in disguise? In other words do we merely behave cooperatively because we expect either to be rewarded for it or to be able to avoid some sort of punishment by doing it? In his book Social: why our brains are wired to connect, Matt Lieberman writes about the work of neuroscientist James Rilling who has conducted fMRI studies of subjects playing prisoner's dilemma games.

In a prisoner's dilemma when both players do not cooperate (defect), they both get nothing. When one player defects and the other cooperates, the defector gets the maximum and the cooperator gets nothing. When both cooperate they both get a medium reward. Rilling observed more ventral striatum activity when players chose to cooperate then when they chose to defect. In other words, they felt more reward about the total outcome for both players than for their personal outcome. The lateral prefrontal regions were not involved when cooperation was chosen. This suggests that for people cooperation is an end it itself, not self-interest in disguise. These results were not only found in studies in which players had to play the prisoners's dilemma games multiple times against each other but also when they had to play only one time. However, when the subjects played the game against a computer instead of against a real person, mutual cooperation did not activate the reward system.
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