Effects of reward bundling on male rats' preference for larger-later food rewards.
Effects of reward bundling on male rats' preference for larger-later food rewards.
复制标题
奖励捆绑对雄性大鼠对较大较晚食物奖励的偏好的影响。
DOI：
10.1002/jeab.11
复制
发表时间：
2013
影响因子：
2.7
通讯作者：
Madden,GregoryJ
中科院分区：
文献类型：
--
作者：
Stein,JeffreyS;Smits,RochelleR;Johnson,PatrickS;Liston,KennanJ;Madden,GregoryJ
在人类和非人类中，先前的研究表明，当奖励捆绑在一起时（即，当一个操作性选择产生多个离散的奖励交付，而不是只有一个交付），人们对大-晚-早的奖励的偏好会增加。这些发现可以用传统的双曲延迟折现模型来预测。本研究旨在检验雄性大鼠奖励束大小对大-晚奖励偏好的参数效应。在奖励捆绑阶段，大鼠被暴露在1（即没有捆绑）、3或9个奖励的捆绑大小中。Bundle - size 9组的大鼠在延迟范围内（0 - 17.5 s）表现出明显高于其他任何组的大鼠，但在选择方面没有观察到其他显著差异。此外，当在奖励捆绑阶段之后评估对非捆绑奖励的选择时，捆绑大小为9的大鼠在较大的奖励偏好上表现出显著的增加（与前测试相比）。从奖励捆绑阶段获得的数据与模型预测的数据进行了比较，并讨论了观察到的非捆绑奖励自我控制增强的潜在机制。
In both humans and nonhumans, prior research demonstrates increased preference for larger‐later over smaller‐sooner rewards when rewards are bundled together in a series (i.e., when an operant choice produces multiple discrete reward deliveries, as opposed to only a single delivery). These findings can be predicted using a traditional hyperbolic delay‐discounting model. The present study was designed to examine the parametric effects of the size of the reward bundle on larger‐later reward preference in male rats. During a reward‐bundling phase, rats were exposed to bundle‐sizes of either 1 (i.e., no bundling), 3, or 9 rewards. Rats in the Bundle‐size 9 group showed significantly greater larger‐later reward preference across a range of delays (0‐17.5 s) than rats in any other group, but no other significant differences in choice were observed between groups. In addition, when choice for unbundled rewards was assessed following the reward‐bundling phase, rats in the Bundle‐size 9 group showed a significant increase in larger‐later reward preference (compared to a pre‐test). Obtained data from the reward‐bundling phase are compared to model‐predicted data, and potential mechanisms of the observed increase in self‐control for unbundled rewards are discussed.
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