The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Stephen P Lewis - One of the best experts on this subject based on the ideXlab platform.
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vector based spatial temporal minimum l1 Norm Solution for meg
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Tao Song, Eric Halgren, Anders M. Dale, Stephen P LewisAbstract:Abstract Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly “jumps” from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial “spiky-looking” discontinuity. In the present study, we present a new vector-based spatial–temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. “Spiky-looking” discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal–parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined.
Jose M Canive - One of the best experts on this subject based on the ideXlab platform.
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vector based spatial temporal minimum l1 Norm Solution for meg
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Tao Song, Eric Halgren, Anders M. Dale, Stephen P LewisAbstract:Abstract Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly “jumps” from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial “spiky-looking” discontinuity. In the present study, we present a new vector-based spatial–temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. “Spiky-looking” discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal–parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined.
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Vector-based spatial-temporal minimum L1-Norm Solution for MEG
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Stephen Lewis, Tao Song, Eric Halgren, Anders M. Dale, Roland R. LeeAbstract:Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly "jumps" from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial "spiky-looking" discontinuity. In the present study, we present a new vector-based spatial-temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. "Spiky-looking" discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal-parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined. ?? 2006 Elsevier Inc. All rights reserved.
Ming Xiong Huang - One of the best experts on this subject based on the ideXlab platform.
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vector based spatial temporal minimum l1 Norm Solution for meg
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Tao Song, Eric Halgren, Anders M. Dale, Stephen P LewisAbstract:Abstract Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly “jumps” from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial “spiky-looking” discontinuity. In the present study, we present a new vector-based spatial–temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. “Spiky-looking” discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal–parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined.
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Vector-based spatial-temporal minimum L1-Norm Solution for MEG
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Stephen Lewis, Tao Song, Eric Halgren, Anders M. Dale, Roland R. LeeAbstract:Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly "jumps" from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial "spiky-looking" discontinuity. In the present study, we present a new vector-based spatial-temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. "Spiky-looking" discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal-parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined. ?? 2006 Elsevier Inc. All rights reserved.
Roland R. Lee - One of the best experts on this subject based on the ideXlab platform.
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Vector-based spatial-temporal minimum L1-Norm Solution for MEG
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Stephen Lewis, Tao Song, Eric Halgren, Anders M. Dale, Roland R. LeeAbstract:Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly "jumps" from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial "spiky-looking" discontinuity. In the present study, we present a new vector-based spatial-temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. "Spiky-looking" discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal-parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined. ?? 2006 Elsevier Inc. All rights reserved.
D. L. Harrington - One of the best experts on this subject based on the ideXlab platform.
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vector based spatial temporal minimum l1 Norm Solution for meg
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Tao Song, Eric Halgren, Anders M. Dale, Stephen P LewisAbstract:Abstract Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly “jumps” from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial “spiky-looking” discontinuity. In the present study, we present a new vector-based spatial–temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. “Spiky-looking” discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal–parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined.
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Vector-based spatial-temporal minimum L1-Norm Solution for MEG
NeuroImage, 2006Co-Authors: Ming Xiong Huang, Jose M Canive, D. L. Harrington, Igor Podgorny, Stephen Lewis, Tao Song, Eric Halgren, Anders M. Dale, Roland R. LeeAbstract:Minimum L1-Norm Solutions have been used by many investigators to analyze MEG responses because they provide high spatial reSolution images. However, conventional minimum L1-Norm approaches suffer from instability in spatial construction, and poor smoothness of the reconstructed source time-courses. Activity commonly "jumps" from one grid point to (usually) the neighboring grid points. Equivalently, the time-course of one specific grid point can show substantial "spiky-looking" discontinuity. In the present study, we present a new vector-based spatial-temporal analysis using a L1-minimum-Norm (VESTAL). This approach is based on a principle of MEG physics: the magnetic waveforms in sensor-space are linear functions of the source time-courses in the imaging-space. Our computer simulations showed that VESTAL provides good reconstruction of the source amplitude and orientation, with high stability and reSolution in both the spatial and temporal domains. "Spiky-looking" discontinuity was not observed in the source time-courses. Importantly, the simulations also showed that VESTAL can resolve sources that are 100% correlated. We then examined the performance of VESTAL in the analysis of human median-nerve MEG responses. The results demonstrated that this method easily distinguishes sources very spatially close to each other, including individual primary somatosensory areas (BA 1, 2, 3b), primary motor area (BA 4), and other regions in the somatosensory system (e.g., BA 5, 7, SII, SMA, and temporal-parietal junction) with high temporal stability and reSolution. VESTAL's potential for obtaining information on source extent was also examined. ?? 2006 Elsevier Inc. All rights reserved.
