Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies.

Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies. Research Abstract Details 

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Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies. Abstract Text:

Donna R Ramirez,Lisa M Savage,

In 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.

Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies. Publishing Authors By Initials

DR Ramirez,LM Savage,

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Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Behavioral neuroscience

VOLUME: 121

Page Numbers: 896-906

Journal Abbreviation: Behav. Neurosci.

ISSN: 0735-7044

DAY: 20

MONTH: Oct

YEAR: 2007

Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies. Information

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LANGUAGE: eng

NlmUniqueID: 8302411

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Grant and Affiliation Information for Differential involvement of the basolateral amygdala, orbitofrontal cortex, and nucleus accumbens core in the acquisition and use of reward expectancies.

AFFILIATION: Department of Psychology, State University of New York at Binghamton, Binghamton, NY, USA. ramirezd@email.unc.edu

Country: United States

AGENCY: United States PHS

GRANT: 054272

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MEDLINETA: Behav Neurosci

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