Abstract
Single-unit recordings were made in the entopeduncular nucleus of cats which had previously undergone ipsilateral caudate lesions. During penicillin-induced epileptiform discharge from the pericruciate cortex, the percentage of responsive entopeduncular neurons in animals with a lesion was less than 20%. In a previous study in intact cats and in control experiments in the present study the percentage of responsive entopeduncular cells was more than 75%. These results indicate that propagation of epileptic discharge through the basal ganglia depends on intact pathways from the cortex to the caudate and from the caudate to the entopeduncular nucleus.
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