The fronto-parietal network is involved in top-down and bottom-up processes necessary to achieve cognitive control. We investigated the role of asymmetric enhancement of the left dorsolateral prefrontal cortex (lDLPFC) and right posterior parietal cortex (rPPC) in cognitive control under conditions of emotional conflict arising from emotional distractors. The effects of anodal tDCS over the lDLPFC/cathodal over the rPPC and the effects of anodal tDCS over the rPPC/cathodal over the lDLPFC were compared to sham tDCS in a double-blind design. The findings showed that anodal stimulation over the lDLPFC reduced interference from emotional distractors, but only when participants had already gained experience with the task. In contrast, having already performed the task only eliminated facilitation effects for positive stimuli. Importantly, anodal stimulation of the rPPC did not affect distractors’ interference. Therefore, the present findings indicate that the lDLPFC plays a crucial role in implementing top-down control to resolve emotional conflict, but that experience with the task is necessary to reveal this role.

中文翻译：

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前顶叶网络对 Word-Face Interference 任务中情绪冲突的不对称贡献

额顶叶网络参与实现认知控制所需的自上而下和自下而上的过程。我们研究了左背外侧前额叶皮层 (lDLPFC) 和右后顶叶皮层 (rPPC) 的不对称增强在情绪干扰因素引起的情绪冲突条件下在认知控制中的作用。在双盲设计中将阳极 tDCS 对 lDLPFC/阴极对 rPPC 的影响和阳极 tDCS 对 rPPC/阴极对 lDLPFC 的影响与假 tDCS 进行比较。研究结果表明，对 lDLPFC 的阳极刺激减少了来自情绪干扰因素的干扰，但前提是参与者已经获得了该任务的经验。相比之下，已经完成任务只会消除对积极刺激的促进作用。重要的，rPPC 的阳极刺激不影响干扰物的干扰。因此，目前的研究结果表明，lDLPFC 在实施自上而下的控制以解决情绪冲突方面发挥着至关重要的作用，但该任务的经验对于揭示这一作用是必要的。