Linked Life Data

16613600

Source:http://linkedlifedata.com/resource/pubmed/id/16613600

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pubmed-article:16613600pubmed:abstractTextCorticotropin-releasing factor (CRF) is typically considered to mediate aversive aspects of stress, fear and anxiety. However, CRF release in the brain is also elicited by natural rewards and incentive cues, raising the possibility that some CRF systems in the brain mediate an independent function of positive incentive motivation, such as amplifying incentive salience. Here we asked whether activation of a limbic CRF subsystem magnifies the increase in positive motivation for reward elicited by incentive cues previously associated with that reward, in a way that might exacerbate cue-triggered binge pursuit of food or other incentives? We assessed the impact of CRF microinjections into the medial shell of nucleus accumbens using a pure incentive version of Pavlovian-Instrumental transfer, a measure specifically sensitive to the incentive salience of reward cues (which it separates from influences of aversive stress, stress reduction, frustration and other traditional explanations for stress-increased behavior). Rats were first trained to press one of two levers to obtain sucrose pellets, and then separately conditioned to associate a Pavlovian cue with free sucrose pellets. On test days, rats received microinjections of vehicle, CRF (250 or 500 ng/0.2 microl) or amphetamine (20 microg/0.2 microl). Lever pressing was assessed in the presence or absence of the Pavlovian cues during a half-hour test.lld:pubmed
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pubmed-article:16613600pubmed:authorpubmed-author:BerridgeKent...lld:pubmed
pubmed-article:16613600pubmed:authorpubmed-author:SchulkinJayJlld:pubmed
pubmed-article:16613600pubmed:authorpubmed-author:PeciñaSusanaSlld:pubmed
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pubmed-article:16613600pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:16613600pubmed:year2006lld:pubmed
pubmed-article:16613600pubmed:articleTitleNucleus accumbens corticotropin-releasing factor increases cue-triggered motivation for sucrose reward: paradoxical positive incentive effects in stress?lld:pubmed
pubmed-article:16613600pubmed:affiliationDepartment of Psychology, University of Michigan, Ann Arbor, MI 48109, USA. pesu@umich.edulld:pubmed
pubmed-article:16613600pubmed:publicationTypeJournal Articlelld:pubmed
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