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This would suggest that there is a sort of "morality module" in the brain that is activated at an early age. Evidence from neuroscience would back this up, to a degree. In my last book, The Human Mind, I noted that certain brain areas become activated when we engage in cooperation with others, and that these areas are associated with feelings of pleasure and reward. It also seems that certain areas of the brain are brought into action in situations where we feel empathy and forgiveness.

Taken from here.