Department of Psychology, Dalian Medical University, Dalian, China.
CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing, China.
Neuropsychologia. 2018 Mar;111:45-50. doi: 10.1016/j.neuropsychologia.2018.01.015. Epub 2018 Feb 2.
Previous research found that the neural substrates underlying perceived control highly overlap those of reward system, especially during reward anticipation stage. The current event-related potential study examined whether the experience of choice by which individuals exercise control is modulated by reward probability during reward anticipation stage as indexed by the stimulus-preceding negativity (SPN). Thirty participants performed a cued gambling task during which choices could be made either by themselves (a choice condition) or by a computer (a no-choice condition) with three levels of reward probability (low, medium, and high) while their EEG was recording. As expected, the participants perceived higher control during the choice compared to no-choice condition. Correspondingly, the SPN was enhanced in the choice condition than the no-choice condition. Critically, the SPN choice effect was present when reward probability was high and medium, but was diminished when reward probability was low. These findings suggest that the perceived control as exercised by choice is associated with reward anticipation, which may be sensitive to the fundamental properties of reward.
先前的研究发现，感知控制的神经基础与奖励系统高度重叠，尤其是在奖励预期阶段。本事件相关电位研究旨在通过刺激前负波（SPN）来考察在奖励预期阶段，个体通过选择行使控制时的体验是否会受到奖励概率的调节。30 名参与者在执行提示赌博任务时，可以选择自己（选择条件）或由计算机（无选择条件）进行，奖励概率有低、中、高三档，同时记录他们的 EEG。正如预期的那样，与无选择条件相比，参与者在选择条件下感知到更高的控制感。相应地，选择条件下的 SPN 比无选择条件下更强。重要的是，当奖励概率高和中时，SPN 的选择效应存在，但当奖励概率低时，这种效应减弱。这些发现表明，通过选择行使的感知控制与奖励预期相关，这可能对奖励的基本属性敏感。
