“…For instance, it is now known that altruistic third-party punishment is associated with activation of some brain regions, such as reward regions (e.g., Buckholtz et al 2008, Strobel et al 2011Corradi-Dell'Acqua et al 2012). Past research also shows that the intensity of third-party punishment differs by various factor -individual characteristics, such as justice sensitivity (e.g., Lotz et al 2011), population and the size of societies (e.g., Henrich et al 2006, Marlowe et al 2010, group affiliations, i.e., whether norm violators belong to the punisher's group (e.g., Bernhard et al 2006, Lieberman andLinke 2007), and so forth. The third-party punishment behavior is considered to be unique to humans (e.g., Riedl et al 2012).…”