Brain oscillatory activity during motor imagery in EEG-fMRI coregistration
Brain oscillatory activity during motor imagery in EEG-fMRI coregistration
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DOI：
10.1016/j.mri.2010.06.030
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发表时间：
2010-12-01
影响因子：
2.5
通讯作者：
Manganotti, Paolo
中科院分区：
文献类型：
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作者：
Formaggio, Emanuela;Storti, Silvia Francesca;Manganotti, Paolo
采用脑电(EEG)和功能磁共振成像(FMRI)联合配准的方法，对7名健康受试者在1.5T磁共振扫描仪中想象运动感觉时的脑电活动进行研究，以探讨运动想象(MI)任务中脑振荡活动的地形图变化与血氧水平依赖(BOLD)信号的相关性。对静息和活动状态下的脑电信号进行快速傅立叶变换。我们使用事件相关同步(ERS)/去同步(ERD)方法来表征运动想象力导致α和β功率下降的地方。平均阿尔法图显示ERD减少局限于对侧感觉运动区(SM1c)，并且在同侧感觉运动区(SM1i)出现轻度去同步；而平均β图显示ERD比辅助运动区(SMA)减少。FMRI显示SMA、SM1c、SM1i均有明显激活。结合EEG-fMRI信号，我们获得了有用的新信息，用于描述心肌梗死期间α、β频段振荡活动的变化，以及BOLD活动部位作为产生这些节律的可能来源的研究。通过将BOLD和ERD/ERS联系起来，我们可以更准确地识别哪些区域对电反应的变化有贡献。(C)2010年爱思唯尔公司。好的；保留。
The purpose of the present work was to investigate the correlation between topographical changes in brain oscillatory activity and the blood oxygenation level-dependent (BOLD) signal during a motor imagery (MI) task using electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) coregistration.EEG was recorded in 7 healthy subjects inside a 1.5 T MR scanner during the imagination of the kinesthetic experience of movement. A Fast Fourier Transform was applied to EEG signal in the rest and active conditions. We used the event-related-synchronization (ERS)/ desynchronization (ERD) approach to characterize where the imagination of movement produces a decrease in alpha and beta power.The mean alpha map showed ERD decrease localized over the contralateral sensory motor area (SM1c) and a light desynchronization in the ipsilateral sensory motor area (SM1i); whereas the mean beta map showed ERD decrease over the supplementary motor area (SMA). fMRI showed significant activation in SMA, SM1c, SM1i. The correlation is negative in the contralateral side and positive in the ipsilateral side.Using combined EEG-fMRI signals we obtained useful new information on the description of the changes in oscillatory activity in alpha and beta bands during MI and on the investigation of the sites of BOLD activity as possible sources in generating these rhythms. By correlating BOLD and ERD/ERS we may identify more accurately which regions contribute to changes of the electrical response. (C) 2010 Elsevier Inc. All right; reserved.