The long and the short of it: 5-HTTLPR and moral judgement
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Description: Serotonin has been suggested as a modulator of moral decisions (Siegel et al, 2013). 5-HTTLPR, a functional polymorphism in the promoter region of the serotonin transporter gene, effects serotonergic function and has thus be investigated regarding its role in moral judgements. Available evidence is mixed with some studies (Marsh et al. 2011; Martinez et al., 2020) suggesting that the long (L) allele of the polymorphism is associated with increased endorsement of harmful actions for the greater good. However, a large recent study (Yang et al., 2019) reported greater moral permissibility ratings for harmful actions in SS homozygotes. Using the approach suggested by Conway & Gawronski (2013) we aim to investigate whether there are differences between 5-HTTLPR genotypes in moral judgements as well as in underlying deontological and utilitarian tendencies.