Load modulates the alpha and beta oscillatory dynamics serving verbal working memory

被引:48
|
作者
Proskovec, Amy L. [1 ,2 ,3 ]
Heinrichs-Graham, Elizabeth [2 ,3 ]
Wilson, Tony W. [1 ,2 ,3 ]
机构
[1] Univ Nebraska, Dept Psychol, Omaha, NE 68182 USA
[2] Univ Nebraska Med Ctr, Ctr Magnetoencephalog, 988422 Nebraska Med Ctr, Omaha, NE 68198 USA
[3] UNMC, Dept Neurol Sci, Omaha, NE 68198 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
Magnetoencephalography (MEG); Oscillation; Encoding; Maintenance; Theta; HUMAN BRAIN; N-BACK; NEURONAL DYNAMICS; VISUAL PATHWAYS; EEG-THETA; ATTENTION; MAINTENANCE; SIGNAL; LATERALIZATION; ACTIVATION;
D O I
10.1016/j.neuroimage.2018.09.022
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
A network of predominantly left-lateralized brain regions has been linked to verbal working memory (VWM) performance. However, the impact of memory load on the oscillatory dynamics serving VWM is far less understood. To further investigate this, we had 26 healthy adults perform a high-load (6 letter) and low-load (4 letter) variant of a VWM task while undergoing magnetoencephalography (MEG). MEG data were evaluated in the time-frequency domain and significant oscillatory responses spanning the encoding and maintenance phases were reconstructed using a beamformer. To determine the impact of load on the neural dynamics, the resulting images were examined using paired-samples t-tests and virtual sensor analyses. Our results indicated stronger increases in frontal theta activity in the high- relative to low-load condition during early encoding. Stronger decreases in alpha/beta activity were also observed during encoding in bilateral posterior cortices during the high-load condition, and the strength of these load effects increased as encoding progressed. During maintenance, stronger decreases in alpha activity in the left inferior frontal gyrus, middle temporal gyrus, supramarginal gyrus, and inferior parietal cortices were detected during high- relative to low-load performance, with the strength of these load effects remaining largely static throughout maintenance. Finally, stronger increases in occipital alpha activity were observed during maintenance in the high- load condition, and the strength of these effects grew stronger with time during the first half of maintenance, before dissipating during the latter half of maintenance. Notably, this was the first study to utilize a whole-brain approach to statistically evaluate the temporal dynamics of load-related oscillatory differences during encoding and maintenance processes, and our results highlight the importance of spatial, temporal, and spectral specificity in this regard.
引用
收藏
页码:256 / 265
页数:10
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