基于静息态功能MRI的认知储备对脑网络的影响研究

Study of effects of cognitive reserve on brain networks based on rest state functional magnetic resonance imaging

目的:基于静息态功能磁共振成像(rest state functional magnetic resonance imaging,rsfMRI)图像,探究认知储备对脑网络的影响。方法:首先,在英国生物银行中选择7973名健康中老年人的rsfMRI图像,通过独立成分分析得到21个静息态网络。其次,采用图论分析方法提取网络节点效率、最短路径长度以及节点度中心性等参数。最后,比较并分析静息态网络的活跃程度、网络节点效率、节点最短路径长度以及节点度中心性4个指标,以及这4个指标与受教育程度、早期流体智力、体育运动、休闲活动和社交程度5个认知储备代理指标之间的关系。结果:研究结果表明,受教育程度、早期流体智力和体育运动3个认知储备代理指标与多个静息态网络的活跃程度以及大多数认知控制网络和默认模式网络中的节点效率、节点度中心性之间存在显著的正相关关系,但与大多数认知控制网络和默认模式网络中的最短路径长度之间存在显著的负相关关系。而休闲活动和社交程度2个认知储备代理指标与静息态网络的活跃程度呈负相关关系,且对功能网络整体拓扑特性的影响也相对较小。结论:受教育程度、早期流体智力和体育运动对静息态网络具有重要促进作用,而休闲活动和社交程度这2个认知储备代理指标可能对静息态网络产生负面影响。

Objective To explore the effects of cognitive reserve on brain networks based on rest state functional magnetic resonance imaging(rsfMRI).Methods Firstly,7973 healthy middle-aged and elderly individuals were selected for rsfMRI images at UK Biobank(UKB),and 21 resting-state networks were obtained through group independent component analysis.Secondly,the parameters of network node efficiency,shortest path length and node degree centrality were extracted using graph theory analysis.Finally,four indicators of resting-state networks including activeness,network node efficiency,node shortest path length and node degree centrality were compared and analyzed,whose relationships with five cognitive reserve proxies such as education level,early fluid intelligence,sports,leisure activities and socialization level.Results The education level,early fluid intelligence and sports,and the activity correlated positively with the activeness of multi resting-state networks and the node efficiency and node degree centrality of most of cognitive control networks and default mode networks,while negatively with the shortest path length of most of cognitive control networks and default mode networks.Leisure activities,socialization level and sports had negative correlations with the activeness of the resting-state network,and had little effects on the overall topological properties of the functional network.Conclusion Resting-state networks may be affected positively by education level,early fluid intelligence and sports,while negatively by two cognitive reserve proxies including leisure activities and socialization level.