[1] Chapman Univ, Orange, CA 92866 USA
[2] Univ Exeter, Dept Psychol, Washington Singer Labs, Exeter EX4 4QG, Devon, England
[3] Univ Utah, Anthropol Dept, Salt Lake City, UT 84112 USA
[4] Santa Fe Inst, Santa Fe, NM 87501 USA
[5] NYU, Ctr Neuroecon, New York, NY 10013 USA
[6] Univ Penn, Dept Psychol, Philadelphia, PA 19104 USA
[7] Univ Stirling, Behav Sci Ctr, Stirling Management Sch, Stirling FK9 4LA, Scotland
[8] George Mason Univ, Ctr Study Neuroecon, Fairfax, VA 22030 USA
[9] Univ Missouri, Dept Anthropol, Columbia, MO 65201 USA
[10] Aix Marseille Sch Econ, Ecole Hautes Etud Sci Sociales, Grp Rech Econ Quantitat Aix Marseille, F-13002 Marseille, France
[11] Max Planck Inst Sci Human Hist, D-07745 Jena, Germany
[12] Griffith Univ, Griffith Business Sch, Gold Coast, Qld, Australia