Ageing changes effective connectivity of motor networks during bimanual finger coordination

辅助电机区 运动前皮质 前额叶皮质 神经科学 心理学 形状记忆合金* 老化 运动皮层 抑制性突触后电位 电动机系统 初级运动皮层 功能磁共振成像 生物 认知 解剖 刺激 计算机科学 遗传学 算法
作者
Philipp Alexander Loehrer,Felix Sebastian Nettersheim,Fabienne Jung,Immo Weber,Carlo A. Huber,Till A. Dembek,Esther Annegret Pelzer,Gereon R. Fink,Marc Tittgemeyer,Lars Timmermann
出处
期刊:NeuroImage [Elsevier BV]
卷期号:143: 325-342 被引量:36
标识
DOI:10.1016/j.neuroimage.2016.09.014
摘要

Bimanual finger coordination declines with age. However, relatively little is known about the neurophysiological alterations in the motor-system causing this decline. In the present study, we used 128-channel electroencephalography (EEG) to evaluate causal interactions of cortical, motor-related brain areas. Right-handed young and elderly subjects performed complex temporally and spatially coupled as well as temporally coupled and spatially uncoupled finger tappings. Employing dynamic causal modelling (DCM) for induced responses, we inferred task-induced effective connectivity within a core motor network comprising bilateral primary motor cortex (M1), lateral premotor cortex (lPM), supplementary motor area (SMA), and prefrontal cortex (PFC). Behavioural analysis showed significantly increased error rates and performance times for elderly subjects, confirming that motor functions decrease with ageing. Additionally, DCM analysis revealed that this age-related decline can be associated with specific alterations of interhemispheric and prefrontal to premotor connectivity. Young and elderly subjects exhibited inhibitory left to right M1-M1 coupling during performance of temporally and spatially coupled movements. Effects of ageing on interhemispheric connectivity particularly emerged when movements became spatially uncoupled. Here, elderly participants still expressed inhibitory left to right M1-M1 coupling, whereas no such connection was present in the young. Furthermore, ageing affected prefrontal to premotor connectivity. In all conditions, elderly subjects showed significant couplings from left PFC to left lPM. In contrast, young participants exhibited left PFC to SMA connections. These results demonstrate that (i) in spatially uncoupled movements interhemispheric M1-connectivity increases with age and (ii) support the idea that ageing is associated with enhanced lateral prefrontal to premotor coupling (PFC to lPM) and hypoactivation of a medial pathway (PFC to SMA) within the dominant hemisphere.
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