“…This need for physical activity will require cortical regulation of the limbic system to reduce the physical activity (Campos et al, 2004), and since boys are often more physically active than girls (Harten, Olds, & Dollman, 2008;Haug, Torsheim, Sallis, & Samdal, 2008;Lopes, Vasques, & de Oliveira Pereira, 2006;Nyberg, Nordenfelt, Ekelund, & Marcus, 2009;Waring, Warburton, & Coy, 2007) this regulation may be a more stressful process for the boys. The sex-based segregation we observe already in childhood is reviewed by Pellegrini (2004).…”