Social decline or moral decline is typically characterised [ by whom? ] as reduced adherence to cultural or social norms or values and widespread lapses in ethical behavior. Compare social decay .
The brain areas that are consistently involved when humans reason about moral issues have been investigated by a quantitative large-scale meta-analysis of the brain activity changes reported in the moral neuroscience literature.  In fact, the neural network underlying moral decisions overlapped with the network pertaining to representing others' intentions (., theory of mind) and the network pertaining to representing others' (vicariously experienced) emotional states (., empathy). This supports the notion that moral reasoning is related to both seeing things from other persons' points of view and to grasping others' feelings. These results provide evidence that the neural network underlying moral decisions is probably domain-global (., there might be no such things as a "moral module" in the human brain) and might be dissociable into cognitive and affective sub-systems. 
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