Abstract
SUMMARY For the purpose of studying the electrophysiological activity in the apical dendrites during a seizure, changes of dendritic potentials (DPs) in direct cortical responses were investigated during and after electrically induced seizures. As results, during a seizure, either the DPs were not elicited at all or the DPs depressed in amplitude were elicited. Furthermore, the suppression of the DPs was particulary marked when positive seizure discharges were seen in the cortical surface. In conclusion, from reference to the past studies with intracellular recordings, the suppression of the DPs was considered to indicate that a sustained depolarization took place in the apical dendrites during a seizure and greater depression of the DPs during surface-positive seizure discharges was seemed to suggest that EPSPs arise in the apical dendrites simultaneously with the surface-positive seizure discharges.
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