8 albino rats received bilateral lesions of the hippocampus, 8 received bilateral lesions of the amygdaloid complex, and 8 served as unoperated controls. The rats were trained to find food at the end of an arm of a cross-maze, associated with a conspicuous light stimulus as the first task. Rats were required to relearn the first task with the light stimulus absent. Hippocampal-lesioned rats did not differ from controls on the first task but showed a large deficit on the second task.
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