Recent studies have indicated that ERO theta activity in particular is related to a variety of behavioral, cognitive, and motivational or emotional aspects of human information processing, including reward processing (Basar et al., 2001b; Kahana et al., 2001; Klimesch et al., 2005; Raghavachari et al., 2006; Cohen et al., 2007; Kamarajan et al., 2008). Specifically, ERO theta activity underlying feedback/outcome processing of monetary loss and gain (Luu et al., 2003; Gehring and Willoughby, 2004; Luu et al., 2004; Cohen et al., 2007; Kamarajan et al., 2008; Crowley et al., 2014) has been reported to be a highly useful measure to characterize reward circuitry dysfunction in psychiatric conditions (Oberg et al., 2011; Padrao et al., 2013; Andreou et al., 2015), including alcoholism (Kamarajan et al., 2012; Kamarajan et al., 2015a).
