Electroencephalography (EEG) source imaging is being used more extensively in planning for surgery in case of medically intractable epilepsy. Interictal spikes, generally found in the EEG recordings of patients diagnosed with partial focal epilepsy, are fed into the inverse algorithms to estimate the current density distribution of electrical dipoles modeling the neuronal activity. The usefulness of applying EEG source analysis techniques to estimate the epileptogenic foci has been shown in multiple studies [1–3]. EEG electrodes spatially sample the scalp potential. This means that if the interelectrode distance is not small enough, aliasing will happen [4]. This indicates that the limited number of EEG recordings from the scalp can potentially cause problem. The introduction of high density EEG caps has remedied the problem, yet it is important to know how many electrodes to use to prevent poor performance. Based on previous theoretical...

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