We characterized voltage topography of frontotemporal EEG spikes in 24 patients with complex partial seizures and identified two distinct patterns. "Type 1" spikes possessed a "dipolar" field with a negative region over the inferolateral temporal scalp and a positive region over the contralateral, centroparietal scalp. "Type 2" spikes showed only a broad, frontotemporal negative field. One or the other spike type predominated in all but two patients. Correlations with clinical data and intracranial EEG suggest that type 2 spikes arise from temporal or frontal neocortex, while type 1 spikes involve mesial temporal structures as well as lateral cortex.
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Ebersole et al. (1991) studied this question.