کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
564091 875565 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimal linear spatial filters for event-related potentials based on a spatio-temporal model: Asymptotical performance analysis
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Optimal linear spatial filters for event-related potentials based on a spatio-temporal model: Asymptotical performance analysis
چکیده انگلیسی

In this paper, the estimation of spatio-temporal patterns in the context of event-related potentials or evoked potentials studies in neuroscience is addressed. The proposed framework (denoted xDAWN) has the advantage to require only the knowledge of the time of stimuli onsets which are determined by the experimental setup. A theoretical analysis of the xDAWN framework shows that it provides asymptotically optimal spatial filters under weak assumptions. The loss in signal to interference-plus-noise ratio due to finite sample effect is calculated in a closed form at the first order of perturbation and is then validated by simulations. This last result shows that the proposed method provides interesting performance and outperforms classical methods, such as independent component analysis, in a wide range of situations. Moreover, the xDAWN algorithm has the property to be robust with respect to the model parameter values. Finally, validations on real electro-encephalographic data confirm the good behavior of the proposed xDAWN framework in the context of a P300 speller brain–computer interface.


► We extend the xDAWN algorithm to multi-stimuli event-related potential (ERP) experiments.
► We prove the optimality of the proposed xDAWN algorithm.
► We propose a perturbation analysis of the proposed algorithm.
► We show on both artificial and real signals the accuracy of the proposed method.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Signal Processing - Volume 93, Issue 2, February 2013, Pages 387–398
نویسندگان
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