...
首页> 外文期刊>NeuroImage >EEG alpha distinguishes between cuneal and precuneal activation in working memory.
【24h】

EEG alpha distinguishes between cuneal and precuneal activation in working memory.

机译:脑电图阿尔法区分工作记忆中的脑神经激活和脑神经激活。

获取原文
获取原文并翻译 | 示例
           

摘要

In the literature on EEG during working memory (WM), the role of alpha power (8-13 Hz) during WM retention has remained unclear. We recorded EEG while 18 subjects retained sets of consonants in memory for 3 s; setsize (ss4, ss6, ss8) determines memory workload. Theta power (4-8 Hz) increased with workload in all subjects in middle frontal electrodes. Using ICA, the increase in theta could be attributed to one component whose generators were localized by sLORETA in the medial frontal gyrus. Alpha power in parietal electrode Pz showed a mean increase during retention as compared to prestimulus fixation (event-related synchronization, ERS). On an individual basis, alpha power increased with workload in 9 subjects (WL+ group) and decreased in 9 subjects (WL- group). The alpha increased in upper alpha for the WL+ group (mean: 10.4 Hz) and decreased in lower alpha for the WL- group (mean: 8.9 Hz). Time-frequency representations show high alpha power early during retention for the WL+ group and high alpha power late during retention for the WL- group. sLORETA revealed maximal contrast for the WL+ group in the cuneus and for the WL- group in the precuneus. In subjects with WL+, alpha increase in the cuneus may reflect WM maintenance or active inhibition of task-irrelevant areas. In subjects with WL-, alpha decrease in the precuneus may reflect release of inhibition associated with attentional demands. Thus, alpha EEG characterizes two aspects of processing in the same WM task.
机译:在有关工作记忆(WM)期间脑电图的文献中,WM保留期间α功率(8-13 Hz)的作用尚不清楚。我们记录了脑电图,同时有18名受试者在记忆中保留了3组辅音。 setsize(ss4,ss6,ss8)确定内存工作负载。在中额电极的所有受试者中,θ功率(4-8 Hz)随着工作量的增加而增加。使用ICA,theta的增加可以归因于其成分由sLORETA定位在内侧额回中的一种成分。与刺激前固定(事件相关同步,ERS)相比,顶电极Pz中的α功率在保留期间显示出平均增加。就个人而言,阿尔法能力在9个受试者(WL +组)中随着工作量的增加而增加,在9个受试者(WL-组)中降低。对于WL +组,alpha值的上半部分增加(平均值:10.4 Hz),对于WL-组,alpha值的下半部分减小(平均值:8.9 Hz)。时频表示对于WL +组,在保留期间早期显示高α功率,对于WL-组,在保留期间晚期显示高α功率。 sLORETA揭示了楔形肌中WL +组和早孕神经元中WL-组的最大对比。在患有WL +的受试者中,楔形中α的增加可能反映了WM维持或主动抑制与任务无关的区域。在患有WL-的受试者中,前神经的α降低可能反映了与注意力需求相关的抑制作用的释放。因此,阿尔法脑电图表征了同一WM任务中处理的两个方面。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号