Empathy, target distress, and neurohormone genes interact to predict aggression for others-even without provocation
Personality and Social Psychology Bulletin (2014) - Comment
pubmed: 25287464  doi: 10.1177/0146167214549320  issn: 1552-7433  issn: 0146-1672 

Anneke E. K. Buffone, Michael J. Poulin