Low second-to-fourth digit ratio predicts indiscriminate social suspicion, not improved trustworthiness detection

Jean-François Bonnefon, Wim De Neys and Astrid Hopfensitz

No 13-385, TSE Working Papers from Toulouse School of Economics (TSE)

Abstract: Testosterone administration appears to make individuals less trusting, and this effect was interpreted as an adaptive adjustment of social suspicion, that improved the accuracy of trusting decisions. Here we consider another possibility, namely that testosterone increases the subjective cost of being duped, decreasing the propensity to trust without improving the accuracy of trusting decisions. In line with this hypothesis, we show that second-to-fourth digit ratio (2D:4D, a proxy for organising effects of testosterone in the foetus) correlates with the propensity to trust but not with the accuracy of trusting decisions. Trust game players (N=144) trusted less when they had lower 2D:4D (high prenatal testosterone), but their ability to detect the strategy of other players was constant (and better than chance) across all levels of digit ratio. Our results suggest that early prenatal organizing effects of testoterone in the foetus might impair rather than boost economic outcomes, by promoting indiscriminate social suspicion.

JEL-codes: C91 D03 D64 D87 (search for similar items in EconPapers)
Date: 2013-02
New Economics Papers: this item is included in nep-evo, nep-exp, nep-neu and nep-soc
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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