also present in functional MRI studies of the development of task-related brain activity in adolescents and young adults in a number of different tasks (Rubia et al., 2006; Christakou et al., 2009; Rubia et al., 2010, 2013; Rubia, 2013). Brain networks develop from a pattern of local connectivity to more global patterns of connectivity (Fair et al., 2008, 2009; Power et al., 2010; Supekar et al., 2009; Uddin et al., 2011; Vogel et al., 2010; Zielinski et al., 2010; Menon, 2013; Wu et al., 2013). Systematic changes of the electrophysiology of brain activity occur with age, both in the resting state and in a variety of task related conditions (Segalowitz et al., 2010; Sturman and Moghaddam, 2011). Among the most prominent are decrease in power in oscillatory activity in both resting state and task related activity (Yordanova and Kolev, 1997; Whitford et al., 2007). Sex differences in development have also been observed in task related activity (Nanova et al., 2008, 2011). Previous studies have examined patterns of the development of visual and auditory P3 peak amplitude in adolescents (Katsanis et al., 1996; Hill et al., 1999a; Stige et al., 2007; Nanova et al., 2008; van Beijsterveldt et al., 1998, 2001;
