Ocular artifacts in recording EEGs and event-related potentials II: Source dipoles and source components
Ocular artifacts in recording EEGs and event-related potentials II: Source dipoles and source components
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DOI：
10.1007/bf01234128
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发表时间：
1993-01-01
期刊：
影响因子：
2.7
通讯作者：
Scherg, Michael
中科院分区：
文献类型：
--
作者：
Lins, Otavio G.;Picton, Terence W.;Scherg, Michael
在眼睛运动的方向上，用于眨眼的源偶极子径向地指向，而用于扫视的源偶极子切向地指向。这表明眨眼电位不是由眼球运动产生的，而是由眼睑在带正电荷的角膜上向下滑动产生的。偶极源偶极分析表明，在向上和横向扫视开始时的“骑手伪影”是由眼睑引起的，因为它在运动开始时稍微落后于眼睛。偶极子源分析允许EEG和EOG同时建模，并且EOG发生器与附近的EEG发生器区分开。眼源分量可以从眨眼和扫视期间的EEG和EOG记录的主分量分析来计算。传播因子，源偶极子和源组件在去除眼伪影从EEG样本的有效性进行了评估。最有效的校正程序使用源组件。
The source dipoles for blinks point radially whereas the source dipoles for saccades point tangentially, in the direction of the eye movement. This indicates that blink potentials are not generated by eye movements but by the eyelid sliding down over the positively charged cornea. Dipole source dipole analysis shows that the "rider artifact" at the onset of upward and lateral saccades is caused by the eyelid as it lags a little behind the eyes at the beginning of the movement. Dipole source analysis allows both the EEG and the EOG to be modeled simultaneously and EOG generators to be distinguished from nearby EEG generators. Ocular source components can be calculated from a principal component analysis of EEG and EOG recordings during blinks and saccades. The effectiveness of propagation factors, source dipoles and source components in removing ocular artifacts from EEG samples was assessed. The most effective correction procedure uses source components.