Illustration of the five tasks that were proposed to children to assess their prosocial behaviors.

<p>The Clothespin- and the Two Buttons tasks measured helping and the Elevator-, Trampoline- and Tube tasks measured cooperation. Three of these were adapted versions of tasks designed by Warneken and Tomasello [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0240028#pone.0240028.ref005" target="_blank">5</a>], the others were designed for the current study.</p>