Title | ||
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ICA-based spatiotemporal approach for single-trial analysis of postmovement MEG beta synchronization. |
Abstract | ||
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The extraction of event-related oscillatory neuromagnetic activities from single-trial measurement is challenging due to the non-phase-locked nature and variability from trial to trial. The present study presents a method based on independent component analysis (ICA) and the use of a template-based correlation approach to extract Rolandic beta rhythm from magnetoencephalographic (MEG) measurements of right finger lifting. A single trial recording was decomposed into a set of coupled temporal independent components and corresponding spatial maps using ICA and the reactive beta frequency band for each trial identified using a two-spectrum comparison between the postmovement interval and a reference period. Task-related components survived dual criteria of high correlation with both the temporal and the spatial templates with an acceptance rate of about 80%. Phase and amplitude information for noise-free MEG beta activities were preserved not only for optimal calculation of beta rebound (event-related synchronization) but also for profound penetration into subtle dynamics across trials. Given the high signal-to-noise ratio (SNR) of this method, various methods of source estimation were used on reconstructed single-trial data and the source loci coherently anchored in the vicinity of the primary motor area. This method promises the possibility of a window into the intricate brain dynamics of motor control mechanisms and the cortical pathophysiology of movement disorder on a trial-by-trial basis. |
Year | DOI | Venue |
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2003 | 10.1016/j.neuroimage.2003.07.024 | NeuroImage |
Keywords | DocType | Volume |
Rolandic rhythm,Motor cortex,Single-trial,Magnetoencephalography,Event-related synchronization,Independent component analysis (ICA) | Journal | 20 |
Issue | ISSN | Citations |
4 | 1053-8119 | 8 |
PageRank | References | Authors |
0.87 | 8 | 9 |
Name | Order | Citations | PageRank |
---|---|---|---|
Po-Lei Lee | 1 | 168 | 17.42 |
Yu-Te Wu | 2 | 186 | 28.14 |
Li-Fen Chen | 3 | 18 | 3.31 |
Yong-Sheng Chen | 4 | 314 | 30.12 |
Chou-Ming Cheng | 5 | 8 | 1.20 |
Tzu-Chen Yeh | 6 | 141 | 21.82 |
Low-Tone Ho | 7 | 65 | 9.02 |
Mau-Song Chang | 8 | 11 | 2.49 |
Jen-Chuen Hsieh | 9 | 188 | 27.76 |