Many studies have analyzed working memory (WM) from electroencephalogram (EEG). However, little is known about changes in the brain neurodynamics among resting-state (RS) according to the WM process. Here, we identified frequency-specific power and information flow patterns among three RS EEG before and after WM encoding and WM retrieval. Our results demonstrated the difference in power and information flow among RS EEG in delta (1-3.5 Hz), alpha (8-13.5 Hz), and beta (14-29.5 Hz) bands. In particular, there was a marked increase in the alpha band after WM retrieval. In addition, we calculated the association between significant characteristics of RS EEG and WM performance, and interestingly, correlations were found only in the alpha band. These results suggest that RS EEG according to the WM process has a significant impact on the variability and WM performance of brain mechanisms in relation to cognitive function.
翻译:许多研究分析了电子脑图的工作记忆(WM),然而,根据WM过程,对休息状态(RS)脑神经动力学的变化知之甚少。在这里,我们确定了三个RS EEG在WM编码和WM检索前后的频率特定力量和信息流动模式。我们的结果表明,在德尔塔(1至3.5赫兹)、阿尔法(8至13.5赫兹)和贝塔(14至29.5赫兹)波段中,RS EEG之间的权力和信息流动存在差异。特别是,在WM检索后,阿尔法波段明显增加。此外,我们计算了RS EEG和WM性能的重要特征之间的联系,而且有趣的是,仅在阿尔法波段中发现了相关关系。这些结果表明,根据WM过程,RS EEG对大脑机制在认知功能方面的变异性和WM性有重大影响。