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Sensory Precipitating Epilepsy Focus in El Mice and Mongolian Gerbils

The epileptic seizures occur in an El mouse and a Mongolian gerbil with naturally sensory stimulation. In El mice, a paraboloid movement or a seesaw movement induces seizures very well, and a strange environment or a paraboloid movement does so in Mongolian gerbils. Although the seizure of a Mongolian gerbil is not easily defined as being sensory precipitated, it has many aspects in common with that of an El mouse. In this paper, some characteristic features of seizure foci and generalization of paroxysmal discharges are described. In the ictal EEG of both El mice and Mongolian gerbils, spikes were recognized at first in the unilateral parietal area and spread to the entire cortex within a few seconds. In abortive seizures spikes remained in the restricted regions of the parietal areas. During the interictal periods, most frequently in deep sleep or exceptionally in REM sleep, the spikes showed predominant occurrence in the unilateral parietal area. Thus, in both animals, there were epileptic foci of localized regions of the brain, which were presumed to have a close relationship with the parietal area. It is significant that those foci were spontaneously firing excessively during the interictal period. After a repetition of the stimulus in these animals, occurrences of spikes became more remarkable and showed generalization and seizures occurred finally. Particularly in El