Digit ratios,the menstrual cycle and social preferences |
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| Institution: | 1. Department of Psychology, University of Washington, United States;2. Institute for Learning and Brain Sciences, University of Washington, United States;3. Seattle Children''s Research Institute, United States;4. Department of Radiology, University of Washington, United States;5. University of Washington Autism Center, United States;1. Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, United States;2. Department of Biological Sciences, Human and Evolutionary Biology Section, University of Southern California, Los Angeles, CA, United States;3. Department of Integrative Anatomical Sciences, Keck School of Medicine of University of Southern California, Los Angeles, CA, United States;4. Department of Foods and Nutrition, University of Georgia, Athens, GA, United States;1. Department of Child- and Adolescent Psychiatry, University of Groningen, University Medical Center Groningen, Hanzeplein1, 9713 GZ Groningen, The Netherlands;2. Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS Groningen, The Netherlands;3. Autism Team of the North of the Netherlands (ATN), Laan Corpus den Hoorn 102-2, 9728 JR Groningen, The Netherlands;1. Department of Psychology, Nipissing University, North Bay, Canada;2. Psychology & Language Sciences, University College London, London, UK;3. Psychology Department, University of North Texas, Texas, USA;4. Northern Ontario School of Medicine, North Bay, Canada;1. ERICES, Universidad de Valencia, Spain;2. University of East Anglia, United Kingdom;3. Middlesex University London, United Kingdom |
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| Abstract: | We examine whether social preferences are partially determined by biological factors. We do this by investigating whether digit ratios (2D:4D) and menstrual cycle information are correlated with choices in ultimatum, trust, public good and dictator games. Digit ratios are thought to be a proxy for prenatal testosterone and oestrogen exposure and the menstrual cycle is a proxy for contemporary variations in a range of hormones. We find that digit ratios predict giving in all games. In our preferred specification, giving in the trust and public good games as well as reciprocity in the trust and ultimatum games vary significantly over the menstrual cycle. We discuss possible mechanisms behind these effects and conclude that biological factors play an important role in shaping social preferences. |
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