Ernst Benjamin, Steinhauser Marco
Catholic University Eichstätt-Ingolstadt, Germany.
Catholic University Eichstätt-Ingolstadt, Germany.
Brain Cogn. 2017 Jul;115:33-40. doi: 10.1016/j.bandc.2017.03.008. Epub 2017 Apr 11.
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.
适应性决策要求对决策结果的反馈得到充分处理。最近的研究表明，额中央事件相关电位（ERP）对反馈效价敏感，可作为反馈处理的指标。本研究调查了反馈评估过程是否受到由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学习在后续测试阶段两种刺激中的哪一种与奖励相关。反馈刺激之后会有一个提示，表明反馈是有效还是无效。在每个试次组之前，参与者被告知该试次组中有效反馈的频率。不仅在学习方面，而且在额中央ERP方面都获得了反馈有效性的效应。虽然高有效性反馈与额中央效价效应相关，但低有效性反馈则不存在这种效应。这表明反馈评估过程受到通过自上而下过程的关于反馈有效性的先验知识的影响。
