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回忆相关的功能连接在健康成人的整个生命周期中增加。

Recollection-related increases in functional connectivity across the healthy adult lifespan.

机构信息

Center for Vital Longevity and School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA.

Center for Vital Longevity and School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA.

出版信息

Neurobiol Aging. 2018 Feb;62:1-19. doi: 10.1016/j.neurobiolaging.2017.09.026. Epub 2017 Oct 6.

Abstract

In young adults, recollection-sensitive brain regions exhibit enhanced connectivity with a widely distributed set of other regions during successful versus unsuccessful recollection, and the magnitude of connectivity change correlates with individual differences in recollection accuracy. Here, we examined whether recollection-related changes in connectivity and their relationship with performance varied across samples of young, middle-aged, and older adults. Psychophysiological interaction analyses identified recollection-related increases in connectivity both with recollection-sensitive seed regions and among regions distributed throughout the whole brain. The seed-based approach failed to identify age-related differences in recollection-related connectivity change. However, the whole-brain analysis revealed a number of age-related effects. Numerous pairs of regions exhibited a main effect of age on connectivity change, mostly due to decreased change with increasing age. After controlling for recollection accuracy, however, these effects of age were for the most part no longer significant, and those effects that were detected now reflected age-related increases in connectivity change. A subset of pairs of regions also exhibited an age by performance interaction, driven mostly by a weaker relationship between connectivity change and recollection accuracy with increasing age. We conjecture that these effects reflect age-related differences in neuromodulation.

摘要

在年轻人中,在成功回忆和不成功回忆时,与回忆敏感的脑区有广泛分布的其他区域的连接增强,连接变化的幅度与回忆准确性的个体差异相关。在这里,我们研究了在年轻人、中年人、老年人的样本中,连接变化及其与表现的关系是否存在差异。心理生理交互分析确定了与回忆敏感种子区域以及整个大脑区域的连接增强有关的回忆相关的连接变化。基于种子的方法未能确定与回忆相关的连接变化的年龄相关性差异。然而,全脑分析揭示了许多与年龄相关的影响。许多对区域表现出连接变化的主要年龄效应,主要是由于随着年龄的增长而减少的变化。然而,在控制回忆准确性后,这些年龄效应在很大程度上不再显著,并且那些被检测到的效应现在反映了连接变化的年龄相关性增加。对区域的一对子集也表现出年龄与表现的相互作用,主要是由于连接变化与回忆准确性之间的关系随着年龄的增长而减弱。我们推测这些影响反映了神经调节的年龄相关性差异。

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