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pubmed-article:17907822pubmed:abstractTextIn this study, the authors tested the hypothesis that the basolateral amygdala (BLA), orbitofrontal cortex (OFC), nucleus accumbens core (NA-core), and the extended hippocampus mediate different aspects of the development-maintenance of unique reward expectancies produced by the differential outcomes procedure (DOP). Rats were trained with either DOP or a nondifferential outcomes procedure (NOP) on a simple discrimination task. Fornix lesions did not affect either version of the task, demonstrating that the extended hippocampal system has no role in stimulus-outcome (S-O) associations. In contrast, in the DOP condition, BLA lesions impaired performance throughout training, OFC lesions impaired choice accuracy only in the later maintenance phase, and NA-core lesions resulted in enhanced learning. These results suggest that BLA and OFC are important for establishment (BLA) and behavioral maintenance (OFC) of S-O associations, whereas the NA-core is not needed and can in fact impede using multiple S-O associations. No impairments were observed in the NOP condition, demonstrating that these structures are not critical to stimulus-response learning.lld:pubmed
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pubmed-article:17907822pubmed:authorpubmed-author:RamirezDonna...lld:pubmed
pubmed-article:17907822pubmed:copyrightInfo(PsycINFO Database Record (c) 2007 APA, all rights reserved).lld:pubmed
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pubmed-article:17907822pubmed:articleTitleDifferential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies.lld:pubmed
pubmed-article:17907822pubmed:affiliationDepartment of Psychology, State University of New York at Binghamton, Binghamton, NY, USA. ramirezd@email.unc.edulld:pubmed
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