Projection Versus Prewhitening for EEG Interference Suppression
Projection Versus Prewhitening for EEG Interference Suppression
复制标题
脑电图干扰抑制的投影与预白化
DOI：
10.1109/tbme.2012.2187335
复制
发表时间：
2012
影响因子：
4.6
通讯作者：
Z. Nenadic
中科院分区：
文献类型：
--
作者：
Shun;A. L. Swindlehurst;Po T. Wang;Z. Nenadic
抑制强的、空间相关的背景干扰是与脑电图（EEG）源定位问题相关联的挑战。处理这种干扰的最常见方式是通过使用基于干扰加噪声的协方差估计的预白化变换。这种方法是基于强有力的假设，时间平稳的数据，这并不常见的EEG应用程序。此外，由于协方差矩阵的病态，预白化通常不能直接实现，并且经常需要特殊正则化。使用模拟的例子和实验涉及真实的EEG数据与听觉诱发反应，我们证明了一个简单的干扰投影方法是更强大的比预白化EEG源定位。
Suppression of strong, spatially correlated background interference is a challenge associated with electroencephalography (EEG) source localization problems. The most common way of dealing with such interference is through the use of a prewhitening transformation based on an estimate of the covariance of the interference plus noise. This approach is based on strong assumptions regarding temporal stationarity of the data, which do not commonly hold in EEG applications. In addition, prewhitening cannot typically be implemented directly due to ill conditioning of the covariance matrix, and ad hoc regularization is often necessary. Using both simulation examples and experiments involving real EEG data with auditory evoked responses, we demonstrate that a straightforward interference projection method is significantly more robust than prewhitening for EEG source localization.