(Polich and Criado, 2006; Mantini et al., 2009; Sara and Bouret, 2012; Walz et al., 2014). Studies of visual and auditory target detection tasks using functional magnetic resonance imaging (fMRI) suggest that common, supramodal functional systems are involved as well as modality-specific systems (Walz et al., 2013; Linden et al., 1999). Frequency domain analysis suggests that the theta band event related oscillation (ERO) is a major constituent of the P3 response (Karakas et al., 2000a,b; Yordanova et al., 2003; Jones et al., 2006a,b; Rangaswamy et al., 2007). Theta EROs are important for processes underlying frontal inhibitory control, conscious awareness, recognition memory and episodic retrieval, as shown in a number of experimental contexts (Gevins et al., 1998; Jacobs et al., 2006; Klimesch et al., 1994, 2001, 2008; Vertes, 2005).
