Although novelty P3 (Dien et al., 2003 Debener et al., 2005), no-go P3 (Verleger et al., 2006), error-related negativity (Burle et al., 2008) and other activity in this family (e.g., frontal midline theta; Luu et al., 2004) may have similar generator properties to these heuristic closed fields (cf. Kayser et al., 2007), they are merely intended to serve as an illustration of how inverses and CSD measures may lead to different conclusions. These simulations omit radial contributions from sulci within the longitudinal fissure (e.g., cingulate sulcus), as well as activity on the basal cortical surface, both of which are likely contributors to various midline scalp-recorded phenomena (cf. Tenke et al., 2010). However, any real bilateral midline generator is likely to include a continuum of adjoining cortical regions, and is thereby likely to incorporate both closed- and open-field activity in unknown proportions.
