NEW TOPOGRAPHIC MAPPING OF TEMPORAL-LOBE SEIZURES

A unique topographic map has been developed based on EEG data of ictal events originating from the basal/mesiotemporal lobe regions. This te chnique involves a new mapping method of temporal lobe seizures as opp osed to the interictal activity maps of most commercially available so ftware. The map integrates data from sphenoidal electrodes as well as the standard 10-20 surface electrodes recorded with bipolar montages. A basal view is ideal for visualization of onset of temporal lobe icta l discharges recorded with chronic sphenoidal electrodes. We used the last 150 ictal events from 40 patients with basal/mesiotemporal lobe e pilepsy to develop this technique. Results indicate that a topographic view incorporating sphenoidal and scalp electrodes may provide a usef ul adjunct for interpretation of EEG recordings and a basis for compar ison between and among patient groups for both ictal and interictal ep ileptic discharges.