Abstract
To study the relative contribution of positive and negative transfer during the kindling of motor seizures, we electrically stimulated the septal area and entorhinal cortex in rats according to two different stimulation paradigms. The first consisted of the usual transfer paradigm in which one site was consecutively stimulated until generalized convulsion were elicited and then the other, secondary site was consecutively stimulated ('transfer kindling'). The second paradigm differed only in that both sites were kindled concurrently by alternating stimulation--one site on one trial, the other on the next trial, etc. ('alternate kindling'). In agreement with results from other laboratories, transfer kindling produced positive transfer of seizure susceptibility in either direction between the septum and entorhinal cortex: primary kindling of one site facilitated secondary site kindling of the other. In marked contrast, alternate kindling was characterized by a striking antagonism of seizure development. Thirteen of 14 animals exhibited generalized convulsions from one site only. Motor seizure development at the alternately stimulated site was suppressed despite electrographic and behavioral evidence of limbic activation and despit...Continue Reading
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