| 基于多通道匹配追踪算法的单次脑响应信号建模 |
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| 引用本文： | 江海腾,卢青,韩颖琳,姚志剑,刘刚.基于多通道匹配追踪算法的单次脑响应信号建模[J].东南大学学报,2010(4):546-549. |
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| 作者姓名： | 江海腾 卢青 韩颖琳 姚志剑 刘刚 |
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| 作者单位： | [1]东南大学学习科学研究中心,南京210096 [2]南京医科大学附属脑科医院,南京210029 |
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| 基金项目： | The National Natural Science Foundation of China（No.30900356 81071135）; the National High Technology Research and Development Program of China（863Program）（No.2008AA02Z410） |
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| 摘 要： | 提出了一种基于多通道匹配追踪算法对一维多通道脑磁图非平稳信号进行单次分解的方法.单通道匹配追踪算法通过在过完备的库中自适应地搜索匹配具有良好时频特性的Gabor原子,最终将信号表示为Gabor原子的线性组合.多通道匹配追踪算法是单通道匹配追踪算法的延伸,即所有通道的信号是由发生时间、振荡频率、相位、持续时间相同,但振幅不同的Gabor原子线性叠加组成.结果显示,多通道匹配追踪算法能较好地重建源信号,并且自动检测与分离伪迹噪声.此外,3D源重建结果和心理学先验知识一致,这进一步表明多通道匹配追踪算法应用于脑磁信号单次提取是有效的.
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| 关 键 词： | 脑磁图 单次提取 多通道匹配追踪 源重建 |
Single-trial evoked brain responses modeled by multichannel matching pursuit |
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| Jiang Haiteng Lu Qing Han Yinglin Yao Zhijian Liu Gang.Single-trial evoked brain responses modeled by multichannel matching pursuit[J].Journal of Southeast University(English Edition),2010(4):546-549. |
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| Authors: | Jiang Haiteng Lu Qing Han Yinglin Yao Zhijian Liu Gang |
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| Institution: | Jiang Haiteng Lu Qing Han Yinglin Yao Zhijian Liu Gang(1Research Center for Learning Science,Southeast University,Nanjing 210096,China)(2Nanjing Brain Hospital Affiliated to Nanjing Medical University,Nanjing 210029,China) |
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| Abstract: | A multichannel matching pursuit（MMP）algorithm is proposed to decompose the one-dimensional multichannel non-stationary magnetoencephalography（MEG）signal at a single-trial level.The single-channel matching pursuit（MP）linearly decomposes the signal into a set of Gabor atoms,which are adaptively chosen from an overcomplete dictionary with good time-frequency characters.The MMP is the extension of the MP,which represents multichannel signals using linear combination of Gabor atoms with the same occurrence,frequency,phase,and time width,but varying amplitude in all channels.The results demonstrate that the MMP can optimally reconstruct the original signal and automatically remove artifact noises.Moreover,the coherence between the 3D source reconstruction and the prior knowledge of psychology further suggests that the MMP is effective in MEG single-trial processing. |
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| Keywords: | magnetoencephalography（MEG） single trial multichannel matching pursuit source reconstruction |
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