目的探讨不同程度新生儿缺氧缺血性脑病(hypoxic-ischemic encephalopathy,HIE)患儿脑功能网络的变化,了解该变化对脑功能的影响。方法收集从2017年1月至2020年5月于常州儿童医院新生儿科住院的足月HIE患儿的临床资料,共44例,均进行常...目的探讨不同程度新生儿缺氧缺血性脑病(hypoxic-ischemic encephalopathy,HIE)患儿脑功能网络的变化,了解该变化对脑功能的影响。方法收集从2017年1月至2020年5月于常州儿童医院新生儿科住院的足月HIE患儿的临床资料,共44例,均进行常规和功能磁共振(functional magnetic resonance image,fMRI)成像扫描,有24例符合入组标准,其中轻度患者(PT1组)11例,中重度患者(PT2组)13例。采用低频振幅(amplitude of low frequency fluctuation,ALFF)比较PT1组和PT2组全脑的ALFF值的差异,并采用脑网络连边分析的方法比较PT1组和PT2组脑功能连接(functional connectivity,FC)的差异。结果在连边分析中,与PT1组相比,PT2组大脑中的右侧辅助运动区与右侧中央前回(Z1=0.39,Z2=-0.08)、右侧舌回与右侧海马(Z1=0.61,Z2=0.20)、左侧距状裂皮层与右侧杏仁核(Z1=0.30,Z2=-0.02)、右侧苍白球与右侧后扣带皮层(Z1=0.33,Z2=0.05)的FC减弱(均P<0.001,未校正)。在低频振幅分析中,PT1组和PT2组全脑的ALFF值差异无统计学意义(P>0.05,FDR校正)。结论中重度组HIE患儿在部分脑区的功能连接存在变化,这些功能连接与运动功能、情绪处理、语言发育、认知功能及学习记忆等有关。展开更多
该文将脑功能网络引入到脑电特征提取的研究中,提出一种基于感兴趣脑区LASSO-Granger因果关系的新方法,克服了当前基于孤立脑区的研究方法的不足。先利用主成分分析提取各感兴趣区的最大主成分,然后计算它们之间的LASSO-Granger因果度量...该文将脑功能网络引入到脑电特征提取的研究中,提出一种基于感兴趣脑区LASSO-Granger因果关系的新方法,克服了当前基于孤立脑区的研究方法的不足。先利用主成分分析提取各感兴趣区的最大主成分,然后计算它们之间的LASSO-Granger因果度量,并将其作为特征向量,最后输入支持向量机分类器,对BCI Competition IV dataset 1中的4组数据进行分类识别。结果表明,基于感兴趣脑区间LASSO-Granger因果关系分析和支持向量机分类器的方法对不同的运动想象任务识别率较高,提供了新的研究思路。展开更多
Background: The mechanisms by which acupuncture affects poststroke cognitive impairment (PSCI) remain unclear. Objective: To investigate brain functional network (BFN) changes in patients with PSCI after acupuncture t...Background: The mechanisms by which acupuncture affects poststroke cognitive impairment (PSCI) remain unclear. Objective: To investigate brain functional network (BFN) changes in patients with PSCI after acupuncture therapy. Methods: Twenty-two PSCI patients who underwent acupuncture therapy in our hospital were enrolled as research subjects. Another 14 people matched for age, sex, and education level were included in the normal control (HC) group. All the subjects underwent resting-state functional magnetic resonance imaging (rs-fMRI) scans;the PSCI patients underwent one scan before acupuncture therapy and another after. The network metric difference between PSCI patients and HCs was analyzed via the independent-sample t test, whereas the paired-sample t test was employed to analyze the network metric changes in PSCI patients before vs. after treatment. Results: Small-world network attributes were observed in both groups for sparsities between 0.1 and 0.28. Compared with the HC group, the PSCI group presented significantly lower values for the global topological properties (γ, Cp, and Eloc) of the brain;significantly greater values for the nodal attributes of betweenness centrality in the CUN. L and the HES. R, degree centrality in the SFGdor. L, PCG. L, IPL. L, and HES. R, and nodal local efficiency in the ORBsup. R, ORBsupmed. R, DCG. L, SMG. R, and TPOsup. L;and decreased degree centrality in the MFG. R, IFGoperc. R, and SOG. R. After treatment, PSCI patients presented increased degree centrality in the LING.L, LING.R, and IOG. L and nodal local efficiency in PHG. L, IOG. R, FFG. L, and the HES. L, and decreased betweenness centrality in the PCG. L and CUN. L, degree centrality in the ORBsupmed. R, and nodal local efficiency in ANG. R. Conclusion: Cognitive decline in PSCI patients may be related to BFN disorders;acupuncture therapy may modulate the topological properties of the BFNs of PSCI patients.展开更多
文摘目的探讨不同程度新生儿缺氧缺血性脑病(hypoxic-ischemic encephalopathy,HIE)患儿脑功能网络的变化,了解该变化对脑功能的影响。方法收集从2017年1月至2020年5月于常州儿童医院新生儿科住院的足月HIE患儿的临床资料,共44例,均进行常规和功能磁共振(functional magnetic resonance image,fMRI)成像扫描,有24例符合入组标准,其中轻度患者(PT1组)11例,中重度患者(PT2组)13例。采用低频振幅(amplitude of low frequency fluctuation,ALFF)比较PT1组和PT2组全脑的ALFF值的差异,并采用脑网络连边分析的方法比较PT1组和PT2组脑功能连接(functional connectivity,FC)的差异。结果在连边分析中,与PT1组相比,PT2组大脑中的右侧辅助运动区与右侧中央前回(Z1=0.39,Z2=-0.08)、右侧舌回与右侧海马(Z1=0.61,Z2=0.20)、左侧距状裂皮层与右侧杏仁核(Z1=0.30,Z2=-0.02)、右侧苍白球与右侧后扣带皮层(Z1=0.33,Z2=0.05)的FC减弱(均P<0.001,未校正)。在低频振幅分析中,PT1组和PT2组全脑的ALFF值差异无统计学意义(P>0.05,FDR校正)。结论中重度组HIE患儿在部分脑区的功能连接存在变化,这些功能连接与运动功能、情绪处理、语言发育、认知功能及学习记忆等有关。
文摘该文将脑功能网络引入到脑电特征提取的研究中,提出一种基于感兴趣脑区LASSO-Granger因果关系的新方法,克服了当前基于孤立脑区的研究方法的不足。先利用主成分分析提取各感兴趣区的最大主成分,然后计算它们之间的LASSO-Granger因果度量,并将其作为特征向量,最后输入支持向量机分类器,对BCI Competition IV dataset 1中的4组数据进行分类识别。结果表明,基于感兴趣脑区间LASSO-Granger因果关系分析和支持向量机分类器的方法对不同的运动想象任务识别率较高,提供了新的研究思路。
文摘Background: The mechanisms by which acupuncture affects poststroke cognitive impairment (PSCI) remain unclear. Objective: To investigate brain functional network (BFN) changes in patients with PSCI after acupuncture therapy. Methods: Twenty-two PSCI patients who underwent acupuncture therapy in our hospital were enrolled as research subjects. Another 14 people matched for age, sex, and education level were included in the normal control (HC) group. All the subjects underwent resting-state functional magnetic resonance imaging (rs-fMRI) scans;the PSCI patients underwent one scan before acupuncture therapy and another after. The network metric difference between PSCI patients and HCs was analyzed via the independent-sample t test, whereas the paired-sample t test was employed to analyze the network metric changes in PSCI patients before vs. after treatment. Results: Small-world network attributes were observed in both groups for sparsities between 0.1 and 0.28. Compared with the HC group, the PSCI group presented significantly lower values for the global topological properties (γ, Cp, and Eloc) of the brain;significantly greater values for the nodal attributes of betweenness centrality in the CUN. L and the HES. R, degree centrality in the SFGdor. L, PCG. L, IPL. L, and HES. R, and nodal local efficiency in the ORBsup. R, ORBsupmed. R, DCG. L, SMG. R, and TPOsup. L;and decreased degree centrality in the MFG. R, IFGoperc. R, and SOG. R. After treatment, PSCI patients presented increased degree centrality in the LING.L, LING.R, and IOG. L and nodal local efficiency in PHG. L, IOG. R, FFG. L, and the HES. L, and decreased betweenness centrality in the PCG. L and CUN. L, degree centrality in the ORBsupmed. R, and nodal local efficiency in ANG. R. Conclusion: Cognitive decline in PSCI patients may be related to BFN disorders;acupuncture therapy may modulate the topological properties of the BFNs of PSCI patients.
