RT Journal Article T1 The shadow of the future: 5-Year-olds, but not 3-year-olds, adjust their sharing in anticipation of reciprocation A1 Warneken, Felix A1 Sebastián Enesco, Carla AB Cooperation can be maintained if individuals reciprocate favors over repeated interactions. However, it is not known when during development the psychological capacities to engage in contingent reciprocation emerge. Therefore, we tested when children begin to differentiate between reciprocal and nonreciprocal interactions in their resource sharing. We compared the sharing behavior of 3- and 5-year-olds in two situations. In an experimental condition, the child and a puppet partner alternated the roles of donor and recipient. In a control condition, the puppet had no opportunity to reciprocate. Results showed that 5-year-olds, but not 3-year-olds, increased their sharing toward a potential reciprocator. In addition, we found that children’s ability to delay gratification was positively related to their tendency to share in both conditions. These findings show that reciprocity in anticipation of repeated interactions emerges during middle childhood. Moreover, our results highlight the importance of the ability to delay gratification as a prerequisite for children’s sharing. We discuss how children’s emerging cognitive abilities enable reciprocal sharing in situations where a child must react to or anticipate a partner’s behavior. SN 0022-0965 YR 2015 FD 2015 LK https://hdl.handle.net/20.500.14352/91762 UL https://hdl.handle.net/20.500.14352/91762 LA eng NO Sebastián-Enesco, Carla, y Felix Warneken. «The Shadow of the Future: 5-Year-Olds, but Not 3-Year-Olds, Adjust Their Sharing in Anticipation of Reciprocation». Journal of Experimental Child Psychology, vol. 129, enero de 2015, pp. 40-54. https://doi.org/10.1016/j.jecp.2014.08.007. NO John Templeton Foundation NO Ministerio de Ciencia e Innovación (España) DS Docta Complutense RD 27 dic 2025