From a recent study published in Child Development:

This study investigated the benefits of self-distancing (i.e., taking an outsider’s view of one’s own situation) on young children’s perseverance. Four- and 6-year-old children (N = 180) were asked to complete a repetitive task for 10 min while having the option to take breaks by playing an extremely attractive video game. Six-year-olds persevered longer than 4-year-olds. Nonetheless, across both ages, children who impersonated an exemplar other—in this case a character, such as Batman—spent the most time working, followed by children who took a third-person perspective on the self, or finally, a first-person perspective. Alternative explanations, implications, and future research directions are discussed.

Via the indispensible Marc Bernardin during episode #198 of Fatman on Batman.