Abstract
Slow potential (SP) changes were recorded from the dura of rats following the administration of transpinnate or transcortical electroconvulsive shock (ECS). A relatively brief negative wave of several mV was followed by a prolonged positive SP shift when seizures were induced. Several quantitative characteristics of the pattern of shifts could be related to the intensity of the ECS even at suprathreshold levels for induction of a full behavioral convulsion. Low intensity ECS sometimes resulted in spreading depression waves without a behavioral convulsion. It was conjectured that the pattern of shifts might be related to the severity of retrograde amnesia reported by others to be induced by ECS.
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