Radial maze learning deficits and mediodorsal thalamic damage in context of multifocal seizure-induced brain lesions.

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Abstract
Rats were either trained 21 days after seizure induction or trained before seizure induction and tested 21 days later. The seizures, which induce insidious brain damage within a multitude of diencephalic and subcortical telencephalic structures, were induced by a single injection of lithium (3 mEq/kg sc) followed 24 hr later by pilocarpine (30 mg/kg sc). Compared with controls, the treated rats displayed significant deficits in the acquisition and recall of a radial maze task. Although there was multifocal brain damage, only the amount of damage within the mediodorsal thalamic group was significantly and strongly correlated (rho = .79) with numbers of errors.

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