title: Birth Weight and Social Trust in Adulthood: Evidence for Early Calibration of Social Cognition.
abstract: Social trust forms the fundamental basis for social interaction within societies. Understanding the cognitive architecture of trust and the roots of individual differences in trust is of key importance. We predicted that one of the factors calibrating individual levels of trust is the intrauterine flow of nutrients from mother to child as indexed by birth weight. Birth weight forecasts both the future external environment and the internal condition of the individual in multiple ways relevant for social cognition. Specifically, we predicted that low birth weight is utilized as a forecast of a harsh environment, vulnerable condition, or both and, consequently, reduces social trust. The results of the study reported here are consistent with this prediction. Controlling for many confounds through sibling and panel designs, we found that lower birth weight reduced social trust in adulthood. Furthermore, we obtained tentative evidence that this effect is mitigated if adult environments do not induce stress.
authors.affiliation: Department of Political Science, Aarhus University michael@ps.au.dk.
authors.forename: Michael Bang
authors.initials: MB
authors.lastname: Petersen
authors.affiliation: Department of Political Science, Aarhus University.
authors.forename: Lene
authors.initials: L
authors.lastname: Aarøe
mesh_terms: D000293:Adolescent; D000328:Adult; D001724:Birth Weight; D002648:Child; D003071:Cognition; D005260:Female; D006801:Humans; D008297:Male; D009035:Mothers / Q000523:psychology; D012307:Risk Factors; D035781:Siblings / Q000523:psychology; D012919:Social Behavior; D012923:Social Class; D012931:Social Environment; D013315:Stress, Psychological; D035502:Trust / Q000523:psychology*
keywords: birth weight; evolutionary psychology; life-history strategies; social trust; stress