“…The frontocentral topography of the beta-gamma component observed in the present study for positive feedbacks is compatible with the ventromedial prefrontal activations reported in studies on reward and punishment processing (Kim, Shimojo, & O'Doherty, 2006;Knutson, Fong, Bennett, Adams, & Hommer, 2003;Nieuwenhuis, Slagter, von Geusau, Heslenfeld, & Holroyd, 2005;Tom, Fox, Trepel, & Poldrack, 2007). A follow-up study has also suggested the possible dopaminergic origin of the beta-gamma activity (Marco-Pallarès et al, 2009), in convergence with recent studies showing that changes in dopamine levels are associated with the reestablishment of gamma band oscillations and a change from low-to high-oscillatory activity (Brown et al, 2001;Lalo et al, 2008).…”