“…These EEG results supported two previous ADHD interpretations: low cortical arousal and delayed cortical maturation. The low cortical arousal interpretation was supported by the frontal increase of slow wave pattern (delta and theta), decrease of fast wave pattern (alpha e beta) and increased theta/beta ratio (Castellanos & Acosta, 2002;Loo & Makeig, 2012;Rudo-Hutt, 2015;Sigi Hale et al, 2000;Tannock, 1998;Tye, McLoughlin, Kuntsi, & Asherson, 2011;Willis & Weiler, 2005). In terms of coherence (calculated as the cross-correlation in the frequency domain between two EEG time points, measured simultaneously at different scalp locations), ADHD showed frontal hypercoherence (Sigi Hale et al, 2000;Tye et al, 2011) thought to indicate reduced cortical differentiation (Tye et al, 2011;Willis & Weiler, 2005).…”