title: Human altruism: economic, neural, and evolutionary perspectives.
abstract: Human cooperation represents a spectacular outlier in the animal world. Unlike other creatures, humans frequently cooperate with genetically unrelated strangers, often in large groups, with people they will never meet again, and when reputation gains are small or absent. Experimental evidence and evolutionary models suggest that strong reciprocity, the behavioral propensity for altruistic punishment and altruistic rewarding, is of key importance for human cooperation. Here, we review both evidence documenting altruistic punishment and altruistic cooperation and recent brain imaging studies that combine the powerful tools of behavioral game theory with neuroimaging techniques. These studies show that mutual cooperation and the punishment of defectors activate reward related neural circuits, suggesting that evolution has endowed humans with proximate mechanisms that render altruistic behavior psychologically rewarding.
authors.affiliation: Institute for Empirical Research in Economics, University of Zurich, Bluemlisalpstrasse 10, 8006 Zuerich, Switzerland. efehr@iew.unizh.ch
authors.forename: Ernst
authors.initials: E
authors.lastname: Fehr
authors.forename: Bettina
authors.initials: B
authors.lastname: Rockenbach
mesh_terms: D000533:Altruism; D005075:Biological Evolution; D001921:Brain / Q000033:anatomy & histology / Q000502:physiology*; D001931:Brain Mapping; D004467:Economics; D004644:Emotions / Q000502:physiology; D006801:Humans; D009434:Neural Pathways / Q000033:anatomy & histology / Q000502:physiology; D009483:Neuropsychological Tests; D012201:Reward; D012919:Social Behavior