Suppr超能文献

巴甫洛夫式激励动机和工具性激励学习过程对多巴胺信号传递的差异依赖性。

Differential dependence of Pavlovian incentive motivation and instrumental incentive learning processes on dopamine signaling.

机构信息

Department of Psychiatry & Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, California 90024, USA.

出版信息

Learn Mem. 2011 Jun 21;18(7):475-83. doi: 10.1101/lm.2229311. Print 2011.

Abstract

Here we attempted to clarify the role of dopamine signaling in reward seeking. In Experiment 1, we assessed the effects of the dopamine D(1)/D(2) receptor antagonist flupenthixol (0.5 mg/kg i.p.) on Pavlovian incentive motivation and found that flupenthixol blocked the ability of a conditioned stimulus to enhance both goal approach and instrumental performance (Pavlovian-to-instrumental transfer). In Experiment 2 we assessed the effects of flupenthixol on reward palatability during post-training noncontingent re-exposure to the sucrose reward in either a control 3-h or novel 23-h food-deprived state. Flupenthixol, although effective in blocking the Pavlovian goal approach, was without effect on palatability or the increase in reward palatability induced by the upshift in motivational state. This noncontingent re-exposure provided an opportunity for instrumental incentive learning, the process by which rats encode the value of a reward for use in updating reward-seeking actions. Flupenthixol administered prior to the instrumental incentive learning opportunity did not affect the increase in subsequent off-drug reward-seeking actions induced by that experience. These data suggest that although dopamine signaling is necessary for Pavlovian incentive motivation, it is not necessary for changes in reward experience, or for the instrumental incentive learning process that translates this experience into the incentive value used to drive reward-seeking actions, and provide further evidence that Pavlovian and instrumental incentive learning processes are dissociable.

摘要

在这里,我们试图阐明多巴胺信号在奖励寻求中的作用。在实验 1 中,我们评估了多巴胺 D1/D2 受体拮抗剂氟哌丁苯(0.5mg/kg,ip)对条件性奖励动机的影响,发现氟哌丁苯阻断了条件刺激增强目标趋近和工具表现的能力(条件刺激到工具的转移)。在实验 2 中,我们评估了氟哌丁苯在非条件性再暴露于蔗糖奖励后的训练后,在控制的 3 小时或新的 23 小时禁食状态下对奖励适口性的影响。氟哌丁苯虽然有效阻断了条件性目标趋近,但对适口性或由于动机状态上升而引起的奖励适口性增加没有影响。这种非条件性再暴露提供了工具激励学习的机会,即大鼠对奖励价值进行编码,以便在更新奖励寻求行为时使用的过程。在工具激励学习机会之前给予氟哌丁苯,不会影响该经验诱导的随后脱药奖励寻求行为的增加。这些数据表明,尽管多巴胺信号对于条件性奖励动机是必要的,但它对于奖励体验的变化或对于将这种经验转化为用于驱动奖励寻求行为的激励价值的工具激励学习过程是不必要的,并进一步证明了条件性和工具性激励学习过程是可分离的。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验