在根据外部和内部线索进行运动准备期间,神经信号与初级运动区的连接。

Jumpei Kudo, Minoru Hoshiyama
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引用次数: 0

摘要

目的:我们研究了在运动前与运动相关的磁场期间,从运动相关的皮层区域到运动侧对侧半球初级运动区(M1)的神经信号的连接性:参与者为 13 名健康成年人,使用脑磁图记录神经信号。在内部(IC)和外部(EC)线索任务中,受试者按照自己的节奏和视觉线索自发伸展右腕。通过格兰杰因果关系分析(GCA)评估了各运动相关运动区神经信号与 M1 的连接性。格兰杰因果关系分析是对运动前时期在 7.8 和 46.9 Hz 之间的频段引起的神经活动进行的,这些活动发生在准备场(RF)和负斜率质点(NSp)期间。通过 GCA 获得的连通性值 F 值在 EC 和 IC 提示任务之间进行了比较:结果:在NSp期间,从左上额叶区(SF-L)到M1的神经信号连接在IC任务中占主导地位,而从左上顶叶区(SP-L)到M1的神经信号连接在EC任务中占主导地位。在RF期间,EC任务中从SP-L到M1的GCA的F值要大于同等时间段内的IC任务:在本研究中,IC 任务和 EC 任务中神经信号与 M1 的连接存在差异。本研究结果表明,导致运动的运动前神经活动模式并不统一,而是在运动前不同运动任务之间存在差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Connectivity of neural signals to the primary motor area during preparatory periods for movement following external and internal cues.

Purpose: We investigated the connectivity of neural signals from movement-related cortical areas to the primary motor area (M1) in the hemisphere contralateral to the movement side during the period of movement-related magnetic fields before movement.

Materials and methods: Participants were 13 healthy adults, and nerual signals were recorded using magnetoencephalography. Spontaneous extension of the right wrist was performed at the participant's own pace and following a visual cue in internal (IC) and external (EC) cue tasks. The connectivity of neural signals to M1 from each movement-related motor area was assessed by Granger causality analysis (GCA). The GCA was performed on the neural activity elicited in a frequency band between 7.8 and 46.9 Hz during the pre-movement periods, which occurred durng the readiness field (RF) and the negative slope prime (NSp). F-values, as connectivity values obtained by GCA, were compared between the EC and IC cue tasks.

Results: For NSp periods, the connectivity of neural signals from the left superior frontal area (SF-L) to M1 was dominant in the IC task, whereas that from the left superior parietal area (SP-L) to M1 was dominant in the EC task. The F value in the GCA from SP-L to M1 was greater in the EC task during RF than in the IC task during equivalent periods.

Conslusions: In the present study, there were differences in the connectivity of neural signals to M1 between IC and EC tasks. The present results suggested that the pattern of pre-movement neural activity that resulted in a movement was not uniform but differed between movement tasks just before the movement.

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