Fluctuating asymmetry and behavior in the ultimatum game in Jamaica |
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| Institution: | 1. University of Montpellier 2, France;2. CNRS, Institute of Evolutionary Sciences, Montpellier, France;1. Department of Anthropology, University College London;2. Department of Psychology, University of British Columbia;3. University of British Columbia, Department of Psychology, Vancouver School of Economics, Canadian Institute for Advanced Research;1. Shanghai Key Laboratory of Magnetic Resonance and School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai, SH 200062, China;2. School of Psychology and Cognitive Science, East China Normal University, North Zhongshan Road 3663, Shanghai, SH 200062, China;3. Department of Psychology, Fudan University, Handan Road 220, Shanghai, SH 200433, China;4. Shanghai Key Laboratory of Magnetic Resonance and Department of Physics, East China Normal University, North Zhongshan Road 3663, Shanghai, SH 200062, China;5. School of Psychology, University of Sussex, Sussex House, Brighton BN1 9RH, United Kingdom;1. Departamento de Biología, Universidad Autónoma de Madrid, Madrid, Spain;2. Centro de Estudios Avanzados, Universidad de Playa Ancha, Valparaíso, Chile;3. Department of Economic Theory, University of Barcelona, Barcelona, Spain;4. Edinburgh School of Economics, Edinburgh, UK |
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| Abstract: | The ultimatum game measures cooperative tendencies in humans under experimental conditions. One individual can split money between oneself and another, while the other has the option of accepting or rejecting the offer, with each player receiving the accepted split or nothing if the split is rejected. We studied the association of players' degree of symmetry fluctuating asymmetry (FA)] with behavior in the ultimatum game. Symmetrical males were expected to be less cooperative and, thus, make lower offers (while being more likely to reject unfair offers). In a population of young adult Jamaicans, who are well-characterized for bodily symmetry, we found that symmetrical males made significantly lower offers than asymmetrical ones (p<.001), but found no effect on rejection rates (perhaps due to a very small sample size). No significant association of symmetry and game playing was found in women, but women with a higher body mass index made less generous offers (p<.05). |
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