Abstract
Rats, which had sustained electrolytic lesions in the medial septal area (disrupting hippocampal theta rhythms) or sham operations either before acquisition or between acquisition and extinction, were given either 50% random partial reinforcement (PR) or continuous reinforcement (CRF) during acquisition of a running response for water reward in a straight alley. The magnitude of the partial reinforcement extinction effect (PREE) was reduced in animals lesioned prior to acquisition and probably also in animals lesioned between acquisition and extinction. This reduction in the PREE was about equally due to an increase in resistance to extinction after CRF and a decrease in resistance to extinction after PR. The septal lesions disrupted vibrissae movement and also caused PR animals to be particularly disturbed by a change of environment during acquisition.
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