The development of attention in children is a heterogeneous process. Some attentional capacities develop faster than others because they are dependant of the structural changes that occur during childhood. In this study we tested 156 children in order to determine the development of attention between eight and twelve years old. As this study took place in a primary school, we focused principally in sustained attention because it is a capacity that underlies every learning activity. Sustained attention is the ability to stay on task, which means the ability to consciously inhibit internal and external distracters in order to maintain a performance at the same level all along the task...