Considering the function of empathy from the perspective of a cognitive neuroscientist, what adaptive functions could empathy serve?

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Read the article , and then discuss the purpose, general methods, main results, and significance of the studies. Considering the function of empathy from the perspective of a cognitive neuroscientist, what adaptive functions could empathy serve? Also, consider the implications of lacking empathy.

http://psych.colorado.edu/~kimlab/Rizzolatti.annurev.neuro.2004.pdf