Effect of septal lesions on resistance to extinction and delayed alternation in monkeys

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After initial training to press a bar on a variable interval schedule, 40 rhesus monkeys received septal lesions in the ventral, the dorsal, or both sectors. The Ss with lesions in the ventral sector of the septum showed an increase in resistance to extinction of the bar-press response; extinction performance of Ss with lesions in the dorsal sector did not differ from unoperated controls. Large ventral lesions were followed by repetitive errors on a spatial delayed alternation task. These results indicate that the ventral sector of the septum is part of a neuroanatomical system including the orbital frontal cortex and is concerned with the regulation of dominant response tendencies. (15 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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