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00925njm 22002777a 4500 dc Warneken, Felix author Sebastián Enesco, Carla author 2015 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. 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. 0022-0965 10.1016/j.jecp.2014.08.007 https://hdl.handle.net/20.500.14352/91762 https://doi.org/10.1016/j.jecp.2014.08.007 The shadow of the future: 5-Year-olds, but not 3-year-olds, adjust their sharing in anticipation of reciprocation