The role of pedunculopontine nucleus in choice behavior under risk.

The role of pedunculopontine nucleus in choice behavior under risk.
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DOI:
10.1111/ejn.12529
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发表时间:
2014-05
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Yin HH
Yin HH
中科院分区:
其他
文献类型:
--
作者:
Leblond M;Sukharnikova T;Yu C;Rossi MA;Yin HH

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多巴胺能投射到基底神经节长期以来一直与奖赏引导的行为和决策有关,但对后脚桥核(pPPN)的作用知之甚少,pPPN是中脑边缘多巴胺系统兴奋性输入的主要来源。在这里,我们研究的贡献,pPPN的风险下的决策,使用兴奋性毒性损伤和可逆失活大鼠。老鼠可以在两个选项中做出选择:一个杠杆上的小但确定的奖励,或者另一个杠杆上的大但不确定的奖励。每个选择的总体收益是相同的,但风险选择的回报方差(风险)要高得多。在实验1中,我们发现,兴奋性毒性病变的pPPN训练前并没有影响收购杠杆按压。但是,对照组强烈倾向于安全的选择,而受损的大鼠则不然。在实验2中,我们发现蝇蕈醇失活的pPPN也可逆地改变了选择行为。这些结果表明,永久性病变或可逆性失活的pPPN都取消风险规避的决策。
The dopaminergic projections to the basal ganglia have long been implicated in reward guided behavior and decision making, yet little is known about the role of the posterior pedunculopontine nucleus (pPPN), a major source of excitatory input to the mesolimbic dopamine system. Here we studied the contributions of pPPN to decision making under risk, using excitoxic lesions and reversible inactivation in rats. Rats could choose between two options: a small but certain reward on one lever, or a large but uncertain reward on the other lever. The overall payoff associated with each choice is the same, but the reward variance (risk) associated with the risky choice is much higher. In Experiment 1, we showed that excitotoxic lesions of the pPPN before training did not affect acquisition of lever pressing. But whereas the controls strongly preferred the safe choice, the lesioned rats did not. In Experiment 2, we found that muscimol inactivation of the pPPN also reversibly altered choice behavior. These results show that permanent lesions or reversible inactivation of the pPPN both abolish risk aversion in decision making.
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