Age differences in interhemispheric interactions: callosal structure, physiological function, and behavior.

Age differences in interhemispheric interactions: callosal structure, physiological function, and behavior.
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DOI:
10.3389/fnins.2011.00038
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发表时间:
2011
影响因子:
4.3
通讯作者:
Seidler RD
Seidler RD
中科院分区:
医学2区
文献类型:
--
作者:
Fling BW;Peltier SJ;Bo J;Welsh RC;Seidler RD

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在理解大脑结构和功能网络连接是如何相互关联的,它们如何随年龄变化,以及这些变化如何导致老年人的感觉运动缺陷方面,存在着根本的差距。最近的神经成像方法包括静息状态功能连通性MRI(FcMRI)和扩散张量成像(DTI)已被用于评估脑功能(FcMRI)和结构(DTI)网络连通性,使得对分布式神经系统的综合评估比过去更多。已有大量文献记载了随着年龄的增长,胼胝体大小和显微结构的下降,但它们对单手和双手功能的年龄缺陷的贡献还没有很好的确定。我们最近的工作表明,与年龄相关的膝盖骨大小和完整性的下降是单手和双手控制缺陷的关键因素。此外,我们的数据提供了证据,证明随着年龄的增长,兴奋性和抑制性大脑半球间过程的平衡发生了根本性的变化,导致功能网络连接和结构网络连接之间的关系存在年龄差异。培训研究表明,大脑半球间相互作用的平衡可以随着经验的变化而改变,使其成为未来干预的可行目标。
There is a fundamental gap in understanding how brain structural and functional network connectivity are interrelated, how they change with age, and how such changes contribute to older adults’ sensorimotor deficits. Recent neuroimaging approaches including resting state functional connectivity MRI (fcMRI) and diffusion tensor imaging (DTI) have been used to assess brain functional (fcMRI) and structural (DTI) network connectivity, allowing for more integrative assessments of distributed neural systems than in the past. Declines in corpus callosum size and microstructure with advancing age have been well documented, but their contributions to age deficits in unimanual and bimanual function are not well defined. Our recent work implicates age-related declines in callosal size and integrity as a key contributor to unimanual and bimanual control deficits. Moreover, our data provide evidence for a fundamental shift in the balance of excitatory and inhibitory interhemispheric processes that occurs with age, resulting in age differences in the relationship between functional and structural network connectivity. Training studies suggest that the balance of interhemispheric interactions can be shifted with experience, making this a viable target for future interventions.
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