Reference Estimation in EEG: Analysis of Equivalent Approaches
Reference Estimation in EEG: Analysis of Equivalent Approaches
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DOI：
10.1109/lsp.2011.2173569
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发表时间：
2012-01-01
影响因子：
3.9
通讯作者：
Madhu, N.
中科院分区：
文献类型：
--
作者：
Ranta, R.;Madhu, N.
这封信证明了文献中提出的针对脑电图 (EEG) 记录中的参考估计问题的不同 ICA/波束形成解决方案之间的理论等效性 [1]-[3]。通过参考，我们了解在距离测量电极足够远的参考电极处测量的未知的、非零的、随时间变化的电势。尽管各种方法在理论上是等效的，但它们在实践中并不会产生相同的结果。这种差异主要是由于底层方法的实际实施造成的。我们在这种情况下表明，最可靠的解决方案除了充分利用现有的先验知识之外，还可以避免盲目的源分离和蒙太奇转换。
This letter demonstrates the theoretical equivalence between the different ICA/beamforming based solutions proposed in the literature for the reference-estimation problem in electroen-cephalographic (EEG) recordings [1]-[3]. By reference, we understand an unknown, non-null, time-varying potential, measured at the reference electrode situated sufficiently distant from the measuring electrodes. Despite the theoretical equivalence of the various approaches, they do not yield identical results in practice. This discrepancy is primarily due to the practical implementation of the underlying approach. We show in this context that the most reliable solution avoids blind source separation and montage transformation in addition to making full use of available a priori knowledge.