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Functional network reorganization in older adults: Graph-theoretical analyses of age, cognition and sex
NeuroImage ( IF 4.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.neuroimage.2020.116756
Johanna Stumme 1 , Christiane Jockwitz 1 , Felix Hoffstaedter 2 , Katrin Amunts 3 , Svenja Caspers 4
Affiliation  

Healthy aging has been associated with a decrease in functional network specialization. Importantly, variability of alterations of functional connectivity is especially high across older adults. Whole-brain functional network reorganization, though, and its impact on cognitive performance within particularly the older generation is still a matter of debate. We assessed resting state functional connectivity (RSFC) in 772 older adults (55-85 years, 421 males) using a graph-theoretical approach. Results show overall age-related increases of between- and decreases of within-network RSFC. With similar phenomena observed in young to middle-aged adults, i.e. that RSFC reorganizes towards more pronounced functional network integration, the current results amend such evidence for the old age. The results furthermore indicate that RSFC reorganization in older adults particularly pertain to early sensory networks (e.g. visual and sensorimotor network). Importantly, RSFC differences of these early sensory networks were found to be a relevant mediator in terms of the age-related cognitive performance differences. Further, we found systematic sex-related network differences with females showing patterns of more segregation (i.e. default mode and ventral attention network) and males showing a higher integrated network system (particularly for the sensorimotor network). These findings underpin the notion of sex-related connectivity differences, possibly facilitating sex-related behavioral functioning.

中文翻译:

老年人的功能网络重组:年龄、认知和性别的图论分析

健康老龄化与功能网络专业化的下降有关。重要的是,老年人的功能连接改变的变异性特别高。然而,全脑功能网络重组及其对特别是老一代认知能力的影响仍然是一个有争议的问题。我们使用图论方法评估了 772 名老年人(55-85 岁,421 名男性)的静息状态功能连接 (RSFC)。结果显示网络内 RSFC 之间的总体年龄相关增加和减少。在中青年人中观察到类似的现象,即 RSFC 重组为更显着的功能网络整合,目前的结果修正了老年人的此类证据。结果进一步表明,老年人的 RSFC 重组特别与早期感觉网络(例如视觉和感觉运动网络)有关。重要的是,这些早期感觉网络的 RSFC 差异被发现是与年龄相关的认知表现差异的相关中介。此外,我们发现系统性与性别相关的网络差异,女性表现出更多的隔离模式(即默认模式和腹侧注意力网络),而男性表现出更高的综合网络系统(特别是感觉运动网络)。这些发现支持了与性相关的连接差异的概念,可能促进了与性相关的行为功能。发现这些早期感觉网络的 RSFC 差异是与年龄相关的认知表现差异相关的中介因素。此外,我们发现系统性与性别相关的网络差异,女性表现出更多的隔离模式(即默认模式和腹侧注意力网络),而男性表现出更高的综合网络系统(特别是感觉运动网络)。这些发现支持了与性相关的连接差异的概念,可能促进了与性相关的行为功能。发现这些早期感觉网络的 RSFC 差异是与年龄相关的认知表现差异相关的中介因素。此外,我们发现系统性与性别相关的网络差异,女性表现出更多的隔离模式(即默认模式和腹侧注意力网络),而男性表现出更高的综合网络系统(特别是感觉运动网络)。这些发现支持了与性相关的连接差异的概念,可能促进了与性相关的行为功能。默认模式和腹侧注意力网络)和男性表现出更高的集成网络系统(特别是对于感觉运动网络)。这些发现支持了与性相关的连接差异的概念,可能促进了与性相关的行为功能。默认模式和腹侧注意力网络)和男性表现出更高的集成网络系统(特别是对于感觉运动网络)。这些发现支持了与性相关的连接差异的概念,可能促进了与性相关的行为功能。
更新日期:2020-07-01
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