Hz makes the ORN component relatively more prominent than with the regular filter setting of P3/ORP component. This approach of removing the slow wave activity has already been employed by several studies on error-related negativity (ERN) paradigms. For example, Luu et al. (2004) filtered the ERPs within a 4–12 Hz bandpass, while Trujillo and Allen (2007) used 3–13 Hz bandpass filter in order to optimize ERN component. In our previous study in healthy normals, we used a filter at 2.0 – 16.0 Hz for plotting the ORN topography (Kamarajan et al., 2009).
