Top-down control over feedback processing: The probability of valid feedback affects feedback-related brain activity
Top-down control over feedback processing: The probability of valid feedback affects feedback-related brain activity
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DOI：
10.1016/j.bandc.2017.03.008
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发表时间：
2017-07
影响因子：
2.5
通讯作者：
Benjamin Ernst;M. Steinhauser
中科院分区：
文献类型：
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作者：
Benjamin Ernst;M. Steinhauser
适应性决策要求充分处理关于决策结果的反馈。近年来的研究表明，额中央事件相关电位（ERPs）对反馈效价敏感，可以作为反馈加工的一个指标。本研究考察了反馈评价过程是否受到反馈有效性知识驱动的自上而下机制的影响。在一个简单的决策任务中，参与者必须利用反馈来了解两个刺激中的哪一个与稍后测试阶段的奖励有关。反馈刺激之后是一个提示，表明反馈是否有效或无效。在每个模块之前，参与者被告知该模块中有效反馈的频率。反馈有效性的效果，不仅获得了学习，但也为额中央ERPs。虽然高有效性反馈与额中央效价效应，这种效果是不存在的低有效性反馈。这表明反馈评价过程受反馈有效性先验知识的影响，是通过自上而下的过程进行的。
Adaptive decision-making requires that feedback about decision outcomes is adequately processed. Recent studies have shown that fronto-central event-related potentials (ERPs) are sensitive to feedback valence and can be used as an index of feedback processing. The present study investigated whether the processes involved in feedback evaluation are affected by top-down mechanisms driven by knowledge about feedback validity. In a simple decision task, participants had to make use of feedback to learn which one of two stimuli was associated with a reward in a later test phase. Feedback stimuli were followed by a cue indicating whether feedback was valid or invalid. Prior to each block, participants were informed about the frequency of valid feedback in this block. An effect of feedback validity was obtained not only for learning but also for fronto-central ERPs. While high-validity feedback was associated with a fronto-central valence effect, this effect was absent for low-validity feedback. This indicates that processes involved in feedback evaluation are affected by prior knowledge about feedback validity via top-down processes.