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Competing for limited resources with peers is common among children from an early age, illustrating their propensity to use deceptive strategies to win. We focused on how primary school-age (6–8 years old) children's strategic deception toward peers is associated with their socio-cognitive development (theory of mind and executive functions). In a novel computerized competitive hide-and-seek game, we manipulated the peer opponents' familiarity (familiar vs. unfamiliar) and actions (following vs. not following children's indications), as well as the stimuli likability (liked vs. disliked cards). Our findings demonstrated that children deceived the familiar opponent less than the unfamiliar one, indicating their determination to preserve positive peer interactions. We showed that theory of mind and executive functions significantly predicted children's willingness to deceive. Notably, second-order false belief understanding and visuospatial working memory positively predicted children's use of truths to deceive, whereas inhibitory control and cognitive flexibility efficacy scores were negatively related to their deceptive performance when using the same strategy. Implications for children's competitive behavior toward peers involving lie-telling are discussed.

Early on, young children begin to learn the social skills which will help them navigate through an increasingly complex social world. We explored how deceiving for personal gain potentially interacts with sharing the resulting resources and how they both relate to theory of mind (ToM) and inhibitory control in 3- to 5-year-old children (N = 92, 43 girls). Children played a hide-and-seek zero-sum game in which they could win stickers if they discovered how to deceive the experimenter. Then they were prompted to share their stickers in a dictator game paradigm. Using a microgenetic design, we tracked deceptive behavior across ten sessions and sharing behavior across five of these sessions, plus a follow-up session 15 months later. Children polarized into a group who never deceived across all sessions, and a group who constantly deceived above chance levels (around 85 % of the time). Sharing behavior was extremely low (under 6 % of stickers) across the sessions. At follow-up, deceptive behavior was above 80 %, while sharing remained at a low level (under 5 %). The novelty of our findings was that children who initially discovered how to deceive shared less than the children who didn't use this deceptive strategy. Nonetheless, this pattern was reversed at follow-up. Furthermore, ToM positively predicted deceptive behavior across all sessions and improved after the microgenetic sessions but wasn't related with deception at follow-up. Implications for enabling children to deploy the growing understanding of their worlds in a more prosocial way are discussed.