2000
DOI: 10.1515/bmte.2000.45.7-8.211
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The Influence of Local Tissue Conductivity Changes on the Magnefoencephalogram and the Electroencephalogram - Der Einfluß der Änderung der lokalen Gewebeleitfähigkeit auf das Elektroenzephalogramm und das Magnetoenzephalogramm

Abstract: We examined the influence of local tissue conductivity changes in the vicinity of a dipolar source on the neuromagnetic field and the electric scalp potential using a high resolution finite element method model of the human head. We found that the topology of both the electric scalp potential and the neuromagnetic field (and consequently dipole localization) is influenced significantly by conductivity changes only in voxels adjacent to the source. Conductivity changes in these voxels yield a greater change in … Show more

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Cited by 16 publications
(4 citation statements)
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“…Especially for weaker sources such as radial sources in the MEG, no reliable localization was possible. This is again consistent with the differences in forward modeling found by Vorwerk et al ( 2014 ) and Haueisen et al ( 2000 ), who showed a significant influence of the conductivity of the surrounding area of a source. Van Uitert et al ( 2004 ) showed a strong influence of gray and white matter conductivity especially on the magnetic field.…”
Section: Discussionsupporting
confidence: 91%
“…Especially for weaker sources such as radial sources in the MEG, no reliable localization was possible. This is again consistent with the differences in forward modeling found by Vorwerk et al ( 2014 ) and Haueisen et al ( 2000 ), who showed a significant influence of the conductivity of the surrounding area of a source. Van Uitert et al ( 2004 ) showed a strong influence of gray and white matter conductivity especially on the magnetic field.…”
Section: Discussionsupporting
confidence: 91%
“…In adults, the discrimination of GM/WM conductivities has been described as a factor largely affecting the results of EEG forward and inverse modeling [Haueisen et al, ; Ramon et al, ; Vorwerk et al, ]. This effect is expected to be more pronounced in neonates, because the conductivity of the brain undergoes changes during the course of neurodevelopment due to the myelination process.…”
Section: Discussionmentioning
confidence: 99%
“…One possible reason for this discordant result is that, in the study by Vorwerk et al [], the sources were placed on the innermost layer of the GM or, in other words, the outermost layer of the WM. Consequently, the forward solution of the sources is affected by the adjacent contrast in GM/WM conductivity [Haueisen et al, ]. This effect can be mathematically described by the surface integral over the WM–GM boundaries [Mosher et al, ].…”
Section: Discussionmentioning
confidence: 99%
“…In order to solve the forward problem for arbitrary (and not piecewise homogeneous and isotropic) conductivity distributions, it has been proposed that the field equations should be solved as differential equations in the whole volume using the finite element method (FEM) (Awada et al 1997, Haueisen et al 2000, Laarne et al 2000, Weinstein et al 2000. In this case, conductivity becomes a space-dependent tensor which is, in principle, measurable by magnetic resonance imaging (Tuch et al 2001).…”
Section: Introductionmentioning
confidence: 99%