(i.e., spatial high pass) without resorting to the notorious pitfalls of surface potentials. However, more work is still required to study the applicability of SL estimates based on less flexible splines in the context of functional connectivity and coherence for EEG phenomena generated by very large dipole layers, and whether an approach of using SL estimates obtained with different spline flexibility is a sufficient substitute for the strategy of using both the average reference and flexible SL estimates when investigating global functional integration. Other suspected weaknesses, such as higher sensitivity to noise and insensitivity to deep generators, have not been sustained by empirical evidence. For these practical reasons, the continued preferential use of surface potentials for much of EEG and ERP research appears to be counterintuitive and counterproductive.
