Previous empirical work has detailed delta band activity associated with a myriad of cognitive functions, including reward processing (Bernat et al., 2011; Nelson et al., 2011), target detection (Schürmann et al., 1995; Gilmore et al., 2010), commission of motor errors (Cavanagh et al., 2011; Yordanova et al., 2004), and reward magnitude (Bernat et al., 2012). In contrast to the delta effects exhibited in a gambling-feedback task, where theta and delta were sensitive to different stimuli (theta-loss and delta gain; Bernat et al., 2011), the delta activation detailed in the current report was sensitive to the same experimental effect as theta (i.e., greater for no-go stimuli). This delta activity may dually reflect motor/cognitive inhibition (Smith et al., 2008) and stimulus context updating, similar in function to the P3a (Polich, 2007). From the ERPs presented in Figure 1, delta activity can be observed to occur throughout the ERP window, and while TF-PC analysis indicated that this delta activity significantly contributed to both the N2 and P3 components, regression models indicated that delta clearly contributes most to P3 amplitude. These different delta-related findings
