ELECTROENCEPHALOGRAPHIC CHANGES DURING SIMPLE PARTIAL SEIZURES

We analyzed retrospectively the clinical and EEG data in 13 patients w ith simple partial seizures (SPS). All EEGs were recorded with surface electrodes with the standard 10-20 system and additional closely spac ed scalp and subfrontotemporal skin electrodes. Seventy-seven seizures were recorded. We detected electrographic correlates with SPS in 10 o f 13 patients (77%) and in 47 of 77 seizures (61%). The most common ic tal correlates were rhythmic theta waves or spikes. Of the SPS with EE G changes, 58% were motor, 14% were sensory, and 28% were psychic seiz ures. Use of additional electrodes and recording channels may account for the higher incidence of EEG changes in this study than has been re ported previously in the literature.