The role of oxytocin in influencing trust has been explored by behavioural economists. This study shows how a polymorphism in a gene that encodes for the oxytocin receptor predicts empathy. This is related to work on a genetic basis for autism which is characterized by low empathy.
http://sciencenow.sciencemag.org/cgi/content/full/2009/1116/3?rss=1
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