Behavioral and neural predictors of upcoming decisions
Behavioral and neural predictors of upcoming decisions
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DOI：
10.3758/cabn.5.2.117
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发表时间：
2005-06-01
影响因子：
2.9
通讯作者：
Ranganath, C
中科院分区：
文献类型：
--
作者：
Cohen, MX;Ranganath, C
尽管人们普遍认为，大脑的前额叶皮层、杏仁核和腹侧纹状体等区域在决策过程中发挥着重要作用，但它们的确切作用仍不清楚。在这里，我们使用功能性磁共振成像和强化学习理论的原理来研究当前强化和未来决策之间的关系。在实验中，受试者在高风险（即，低风险（高概率的小额奖励）决策。对于每一个主题，我们估计的价值函数，表示在何种程度上的强化影响的价值在随后的审判的决策选项。价值函数的个体差异不仅预测了试验间的行为策略，例如在高风险奖励后选择高风险决策，而且预测了前额叶和皮层下区域在一次试验中的活动与随后试验中所做决策之间的关系。这些发现提供了行为和神经活动之间的一种新的联系，证明价值功能既表现在行为策略的调整中，也表现在伴随这些调整的神经活动中。
Although it is widely known that brain regions such as the prefrontal cortex, the amygdala, and the ventral striatum play large roles in decision making, their precise contributions remain unclear. Here, we used functional magnetic resonance imaging and principles of reinforcement learning theory to investigate the relationship between current reinforcements and future decisions. In the experiment, subjects chose between high-risk (i.e., low probability of a large monetary reward) and low-risk (high probability of a small reward) decisions. For each subject, we estimated value functions that represented the degree to which reinforcements affected the value of decision options on the subsequent trial. Individual differences in value functions predicted not only trial-to-trial behavioral strategies, such as choosing high-risk decisions following high-risk rewards, but also the relationship between activity in prefrontal and subcortical regions during one trial and the decision made in the subsequent trial. These findings provide a novel link between behavior and neural activity by demonstrating that value functions are manifested both in adjustments in behavioral strategies and in the neural activity that accompanies those adjustments.