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首页> 外文期刊>The European Journal of Neuroscience >Spectrotemporal dynamics of the EEG during working memory encoding and maintenance predicts individual behavioral capacity
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Spectrotemporal dynamics of the EEG during working memory encoding and maintenance predicts individual behavioral capacity

机译：脑电图在工作记忆编码和维护过程中的时空动态预测个人行为能力

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摘要

We investigated the effect of memory load on encoding and maintenance of information in working memory. Electroencephalography (EEG) signals were recorded while participants performed a modified Sternberg visual memory task. Independent component analysis (ICA) was used to factorise the EEG signals into distinct temporal activations to perform spectrotemporal analysis and localisation of source activities. We found encoding' and maintenance' operations were correlated with negative and positive changes in -band power, respectively. Transient activities were observed during encoding of information in the bilateral cuneus, precuneus, inferior parietal gyrus and fusiform gyrus, and a sustained activity in the inferior frontal gyrus. Strong correlations were also observed between changes in -power and behavioral performance during both encoding and maintenance. Furthermore, it was also found that individuals with higher working memory capacity experienced stronger neural oscillatory responses during the encoding of visual objects into working memory. Our results suggest an interplay between two distinct neural pathways and different spatiotemporal operations during the encoding and maintenance of information which predict individual differences in working memory capacity observed at the behavioral level.
机译：我们调查了内存负载对工作内存中信息的编码和维护的影响。当参与者执行修改的Sternberg视觉记忆任务时，记录脑电图（EEG）信号。独立成分分析（ICA）用于将EEG信号分解为不同的时间激活，以进行光谱时态分析和源活动的定位。我们发现编码和维护操作分别与带功率的负和正变化相关。在信息编码过程中观察到了短暂的活动，该信息在双侧楔骨，前神经突，顶顶下回和梭状回中，并且在额下回中持续存在。在编码和维护过程中，动力和行为性能的变化之间也观察到强烈的相关性。此外，还发现具有较高工作记忆能力的个体在将视觉对象编码为工作记忆期间经历了较强的神经振荡反应。我们的结果表明，在信息的编码和维护过程中，两个不同的神经通路与不同的时空操作之间存在相互作用，这些信息预测了行为水平上观察到的工作记忆能力的个体差异。

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