Abstract
Infant rats received either lesions of the septal nuclei or control operations at 7 days of age. Following weaning at 21 days, the infant rats were trained to leverpress for food. A DRL 20-sec schedule was then used, with the rats being tested in either a conventional operant chamber or one which contained wooden balsa blocks. DRL training continued for 40 daily 60-min sessions. The infant rats successfully leverpressed for food. The presence of the wooden blocks facilitated the development of efficient DRL behavior in the rats with septal lesions, but not in the controls. With training, the juvenile rats with septal lesions trained in conventional chambers showed an improvement in their DRL behavior.
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