Watts Adreanna T M, Bachman Matthew D, Bernat Edward M
Department of Psychology, University of Maryland, United States.
Center for Cognitive Neuroscience, Duke University, United States.
Biol Psychol. 2017 Oct;129:242-252. doi: 10.1016/j.biopsycho.2017.08.054. Epub 2017 Sep 1.
The roles of outcome valence and expectancy in feedback processing have been investigated as important factors modulating event-related potential (ERP) measures including the feedback negativity (FN) and P300, but results have been inconsistent. Recent work from our group has shown that processes underlying the FN and P300 are better represented as separable processes in the theta (3-7Hz) and delta (0-3Hz) ranges using time-frequency analysis. The current study evaluated the modulation of time-domain FN and P300 and time-frequency theta and delta to outcome valence and expectancy in a gambling feedback task paradigm. Results revealed that the FN was sensitive to valence but not expectancy, and that valence effects were driven by loss-sensitive theta and gain-sensitive delta. Alternatively, the P300 was sensitive to the expectedness of outcomes but only for gain trials, and these expectancy differences were explained by time-frequency delta not theta. These results add to a growing body of research showing that time-frequency measures reflect separable processes underlying time-domain components, where theta is more sensitive to primary task features and less sensitive to secondary features while delta is sensitive to primary and more complex, secondary task features.
结果效价和期望在反馈处理中的作用已被作为调节事件相关电位（ERP）指标（包括反馈负波（FN）和P300）的重要因素进行了研究，但结果并不一致。我们团队最近的研究表明，使用时频分析，FN和P300背后的过程在θ（3 - 7Hz）和δ（0 - 3Hz）频段中能更好地表示为可分离的过程。本研究在赌博反馈任务范式中评估了时域FN和P300以及时频θ和δ对结果效价和期望的调节作用。结果显示，FN对效价敏感而对期望不敏感，且效价效应由损失敏感的θ和收益敏感的δ驱动。另外，P300对结果的预期性敏感，但仅在收益试验中如此，并且这些期望差异由时频δ而非θ来解释。这些结果进一步丰富了越来越多的研究，表明时频测量反映了时域成分背后的可分离过程，其中θ对主要任务特征更敏感，对次要特征较不敏感，而δ对主要和更复杂的次要任务特征均敏感。
