反馈评估的局部背景依赖效应：ERP研究

人脑对反馈的评估依赖于其所处背景。但是只能依赖整体背景(整个组块的结果范围), 还是可以依赖局部背景(单个试次的结果范围)进行评估, 目前并不清楚。本研究通过获益/损失线索操纵所在试次的反馈背景, 探讨反馈评估仅依赖整体背景, 还是可延伸到局部水平。25名被试参与实验。结果发现, 背景试次间变化时, 在获益背景下, ￥0 (负反馈)比+ ￥4 (正反馈)引发更负的FRN (feedback-related negativity); 在损失背景下, - ￥4 (负反馈)比￥0 (正反馈)引发更负的FRN。这一结果说明反馈评估以某线索背景中可能的结果为参考对象, FRN的背景依赖可以延伸到局部水平。结合前人研究, 推测任务类型和反馈真实性会调节背景依赖水平。在含真实反馈的主动性任务中, FRN的背景依赖效应可延伸至局部水平。

Local context dependence in feedback evaluation: An ERP study

Previous research has indicated that feedback evaluation depends on its embedded context, and feedback related negativity (FRN) is also context-dependent. However, it is still disputed whether feedback evaluation merely relies on the global context (the range of all possible outcomes in a block) or also on the local context (the range of possible outcomes on a given trial). Thus, the current study investigated whether the context-dependent effect could be extended from the global context to the local context. We assumed that if feedback evaluation is in a global context-dependent manner, then all non-reward feedback in a given block should elicit a related negativity; however, if feedback evaluation is in a local context-dependent manner, then a related negativity should be discovered for the relative unfavorable feedback compared to the relative favorable feedback in a given trial context.