Development of Trust and Reciprocity Running head: Development of Trust and Reciprocity Development of Trust and Reciprocity in Adolescence Wouter van den Bos 1,2 , Michiel Westenberg 1 , Eric van Dijk 1 , Eveline A. Crone 1,2 1 Leiden University – Department of Psychology, the Netherlands, 2 Leiden Institute for Brain and Cognition, the Netherlands, ____________________ Send correspondence to: Wouter van den Bos, Department of Psychology, Leiden University, Wassenaarseweg 52, 2300 RB, Leiden, The Netherlands. Email: WBos@fsw.leidenuniv.nl * Title Page