Localizing True Brain Interactions from EEG and MEG Data with Subspace Methods and Modified Beamformers
المؤلفون المشاركون
Nolte, Guido
Ewald, Arne
Shahbazi Avarvand, Forooz
المصدر
Computational and Mathematical Methods in Medicine
العدد
المجلد 2012، العدد 2012 (31 ديسمبر/كانون الأول 2012)، ص ص. 1-11، 11ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2012-06-27
دولة النشر
مصر
عدد الصفحات
11
التخصصات الرئيسية
الملخص EN
To address the problem of mixing in EEG or MEG connectivity analysis we exploit that noninteracting brain sources do not contribute systematically to the imaginary part of the cross-spectrum.
Firstly, we propose to apply the existing subspace method “RAP-MUSIC” to the subspace found from the dominant singular vectors of the imaginary part of the cross-spectrum rather than to the conventionally used covariance matrix.
Secondly, to estimate the specific sources interacting with each other, we use a modified LCMV-beamformer approach in which the source direction for each voxel was determined by maximizing the imaginary coherence with respect to a given reference.
These two methods are applicable in this form only if the number of interacting sources is even, because odd-dimensional subspaces collapse to even-dimensional ones.
Simulations show that (a) RAP-MUSIC based on the imaginary part of the cross-spectrum accurately finds the correct source locations, that (b) conventional RAP-MUSIC fails to do so since it is highly influenced by noninteracting sources, and that (c) the second method correctly identifies those sources which are interacting with the reference.
The methods are also applied to real data for a motor paradigm, resulting in the localization of four interacting sources presumably in sensory-motor areas.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Shahbazi Avarvand, Forooz& Ewald, Arne& Nolte, Guido. 2012. Localizing True Brain Interactions from EEG and MEG Data with Subspace Methods and Modified Beamformers. Computational and Mathematical Methods in Medicine،Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-469187
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Shahbazi Avarvand, Forooz…[et al.]. Localizing True Brain Interactions from EEG and MEG Data with Subspace Methods and Modified Beamformers. Computational and Mathematical Methods in Medicine No. 2012 (2012), pp.1-11.
https://search.emarefa.net/detail/BIM-469187
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Shahbazi Avarvand, Forooz& Ewald, Arne& Nolte, Guido. Localizing True Brain Interactions from EEG and MEG Data with Subspace Methods and Modified Beamformers. Computational and Mathematical Methods in Medicine. 2012. Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-469187
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-469187
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر