Mixed results of the impact of transcranial direct current stimulation (tDCS) on working memory have been reported. Contrarily to previous studies who focused mainly on stimulating the dorsolateral prefrontal cortex, we modulated the left intraparietal sulcus (IPS) area which is considered to support attentional control aspects of working memory. Using a within-participant experimental design, participants completed three different conditions: anodal stimulation of the IPS, cathodal stimulation of the IPS, and sham stimulation of the IPS. Both visual and verbal working memory tasks were administered. In the visual task, participants had to memorize a random set of colored figures. In the verbal task, participants had to memorize a string of letters. Working memory load was manipulated in both tasks (six figures/letters vs. two figures/letters). No significant differences in accuracy or reaction time between the anodal, cathodal and sham conditions were found. Bayesian analysis supported evidence for an absence of effect. The results of the present study add to the growing body of contradictory evidence regarding the modulatory effects of single session tDCS on working memory performance.

中文翻译：

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顶内沟上的经颅直流电刺激 (tDCS) 不影响工作记忆性能。

经颅直流电刺激 (tDCS) 对工作记忆的影响的混合结果已有报道。与之前主要关注刺激背外侧前额叶皮层的研究相反，我们调节了左顶内沟 (IPS) 区域，该区域被认为支持工作记忆的注意力控制方面。使用参与者内部实验设计，参与者完成了三种不同的条件：IPS 的阳极刺激、IPS 的阴极刺激和 IPS 的假刺激。视觉和语言工作记忆任务都进行了管理。在视觉任务中，参与者必须记住一组随机的彩色图形。在口头任务中，参与者必须记住一串字母。工作记忆负荷在两个任务中都被操纵（六个数字/字母对两个数字/字母）。没有发现阳极、阴极和假条件之间的准确性或反应时间有显着差异。贝叶斯分析支持没有影响的证据。本研究的结果增加了越来越多的关于单次 tDCS 对工作记忆表现的调节作用的矛盾证据。