手指自主按键运动中脑磁图信号的相干性分析

J4 ›› 2011, Vol. 46 ›› Issue (1): 1-5.

• 生命科学 • 下一篇

手指自主按键运动中脑磁图信号的相干性分析

侯文生¹,张阳¹,李卫娜²,吴小鹰¹,吴国材²,冯华²,郑小林¹

1.重庆大学生物流变科学与技术教育部重点实验室, 重庆 400044;
2.第三军医大学附属西南医院神经外科, 重庆 400038

收稿日期:2010-10-16 出版日期:2011-12-14 发布日期:2011-03-16
作者简介:侯文生(1968-),男,博士,教授,博士生导师,主要研究方向为生物医学信息检测与处理、基于MEMS的微型医疗仪器设计、神经工程及康复。Email: hws21cn@yahoo.com.cn
基金资助:
国家自然科学基金资助项目(0770546;30970758);重庆市自然科学基金资助项目(2006BB2043;2007BB5148);重庆大学“211工程”三期创新人才培养计划建设项目(S-09104)

Coherence analysis of magnetoencephalography signals related to self-paced finger press

HOU Wen-sheng1, ZHANG Yang1, LI Wei-na2, WU Xiao-ying1, WU Guo-cai2, FENG Hua2, ZHENG Xiao-lin1

1. Key Laboratory of Biorheological Science and Technology, Ministry of Education, Chongqing University, Chongqing 400044, China;
2.Department of Neurosurgery, Southwest Hospital, Third Military Medical University, Chongqing 400038, China

Received:2010-10-16 Online:2011-12-14 Published:2011-03-16

摘要/Abstract

摘要：

为了获取手指运动过程中不同脑功能区之间的联系,以及这种功能性联系在时频域和空间的变化,记录了与手指运动相关的脑磁图信号,然后对其进行相干性分析,并计算了不同位置信号之间的相干性系数。通过时频分析进一步探讨了在α(5～15Hz)、β(16～25Hz)、lowγ(30～45Hz)3个频带的不同皮层区联系随时间的变化关系。结果表明:α、β、lowγ 3个频带与所选参考信号相干性呈现出位置大致相同,相干强度和相干范围均从α到lowγ依次递减,相干性系数随时间而变化,进而推论出相干性的变化表明对侧运动皮层存在不同的神经模式,而且这些神经模式也是随时间变化的,由此反映出不同功能区的联系在时频域的变化。

关键词: 脑磁图;运动;相干性;时频分析

Abstract:

The present study was aimed at investigating the connection between spatially separated brain regions, as well as the changes of the connection in time and frequency domain. Self-paced finger press related magnetoencephalography signals were recorded and analyzed by means of coherence analysis.And coherence coefficient of two signals corresponding to different cortical areas was calculated. Time frequency analysis was also used to discuss the cortical connection changes co-vary closely with time over the course of motor task in the three frequency band-α(5-15Hz)、β(16-25Hz) and low γ(30-45Hz). The results showed that channels with the most significant coherence relative to the selected reference channel were approximately in the same area, and with the increase of frequency band both the coherence coefficient and the coupled area declined. Moreover, the coherence coefficient changed covaried with time in the three frequency band. Then it is infered that there are different neuronal modulations in the contralateral motor cortex, and this modulation co-varies with time, which consequently reflects the changes of correlation between different brain regions in time and frequency domain.

Key words: magnetoencephalography; movement; coherence; time frequency analysis

侯文生1,张阳1,李卫娜2,吴小鹰1,吴国材2,冯华2,郑小林1. 手指自主按键运动中脑磁图信号的相干性分析[J]. J4, 2011, 46(1): 1-5.

HOU Wen-sheng1, ZHANG Yang1, LI Wei-na2, WU Xiao-ying1, WU Guo-cai2, FENG Hua2, ZHENG Xiao-lin1. Coherence analysis of magnetoencephalography signals related to self-paced finger press[J]. J4, 2011, 46(1): 1-5.

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手指自主按键运动中脑磁图信号的相干性分析

Coherence analysis of magnetoencephalography signals related to self-paced finger press

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