The present study examined the relative contributions of the prefrontal cortex (PFC) and posterior parietal cortex (PPC) to visual working memory. Evidence from a number of different techniques has led to the theory that the PFC controls access to working memory (i.e., filtering), determining which information is encoded and maintained for later use whereas the parietal cortex determines how much information is held at 1 given time, regardless of relevance (i.e., capacity; McNab & Klingberg, 2008; Vogel, McCollough, & Machizawa, 2005). To test this theory, we delivered transcranial DC stimulation (tDCS) to the right PFC and right PPC and measured visual working memory capacity and filtering abilities both during and immediately following stimulation. We observed no evidence that tDCS to either the PFC or PPC significantly improved visual working memory. Although the present results did not allow us to make firm theoretical conclusions about the roles of the PFC and PPC in working memory, the results add to the growing body of literature surrounding tDCS and its associated behavioral and neurophysiological effects. (PsycINFO Database Record

中文翻译：

---

没有证据表明经颅直流电刺激前额叶或顶叶后皮质可增强视觉工作记忆。

本研究检查了前额叶皮质（PFC）和顶叶后皮质（PPC）对视觉工作记忆的相对贡献。来自多种不同技术的证据导致了以下理论：PFC控制对工作内存的访问（即过滤），确定哪些信息被编码并保留以备后用，而顶叶皮层则确定在给定的时间保持1个信息量。 ，而不考虑其相关性（例如，能力； McNab和Klingberg，2008； Vogel，McCollough和Machizawa，2005）。为了验证这一理论，我们将经颅DC刺激（tDCS）传递给正确的PFC和正确的PPC，并在刺激过程中和刺激后立即测量视觉工作记忆能力和过滤能力。我们没有观察到任何证据表明tDCS既可以用于PFC也可以用于PPC，可以明显改善视觉工作记忆。尽管目前的结果不能使我们对PFC和PPC在工作记忆中的作用做出可靠的理论结论，但这些结果增加了围绕tDCS及其相关行为和神经生理学影响的文献量。（PsycINFO数据库记录