Neural basis of the undermining effect of monetary reward on intrinsic motivation
Neural basis of the undermining effect of monetary reward on intrinsic motivation
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DOI：
10.1073/pnas.1013305107
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发表时间：
2010-12-07
影响因子：
11.1
通讯作者：
Matsumoto, Kenji
中科院分区：
文献类型：
--
作者：
Murayama, Kou;Matsumoto, Madoka;Matsumoto, Kenji
与人们普遍认为的奖励激励会产生积极的动机相反，一些研究表明，基于绩效的外在奖励实际上会破坏一个人从事任务的内在动机。这种“破坏效应”具有及时的实际意义，因为在当代社会中，基于业绩的激励制度正在蓬勃发展。它也对经济学和强化学习理论提出了理论挑战，这些理论倾向于假设货币激励单调地增加动机。尽管这种挑衅性的现象在实践和理论上都很重要，但人们对其神经基础知之甚少。在此，我们使用一个新开发的任务诱导了行为破坏效应，并使用功能性MRI跟踪了其神经相关性。我们的研究结果表明，基于绩效的金钱奖励确实会破坏内在动机，这是通过任务中自愿参与的数量来评估的。我们发现前纹状体和前额区的活动沿着减少。这些结果表明，皮质基底神经节评价系统通过整合外部奖励价值和内在任务价值的破坏效应。
Contrary to the widespread belief that people are positively motivated by reward incentives, some studies have shown that performance-based extrinsic reward can actually undermine a person's intrinsic motivation to engage in a task. This "undermining effect" has timely practical implications, given the burgeoning of performance-based incentive systems in contemporary society. It also presents a theoretical challenge for economic and reinforcement learning theories, which tend to assume that monetary incentives monotonically increase motivation. Despite the practical and theoretical importance of this provocative phenomenon, however, little is known about its neural basis. Herein we induced the behavioral undermining effect using a newly developed task, and we tracked its neural correlates using functional MRI. Our results show that performance-based monetary reward indeed undermines intrinsic motivation, as assessed by the number of voluntary engagements in the task. We found that activity in the anterior striatum and the prefrontal areas decreased along with this behavioral undermining effect. These findings suggest that the corticobasal ganglia valuation system underlies the undermining effect through the integration of extrinsic reward value and intrinsic task value.