Effects of attention and precision of exerted force on beta range EEG-EMG synchronization during a maintained motor contraction task
Effects of attention and precision of exerted force on beta range EEG-EMG synchronization during a maintained motor contraction task
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DOI：
10.1016/s1388-2457(01)00722-2
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发表时间：
2002-01-01
影响因子：
4.7
通讯作者：
Lücking, CH
中科院分区：
文献类型：
--
作者：
Kristeva-Feige, R;Fritsch, C;Lücking, CH
目的：本研究旨在探讨注意力和施加力的精确水平对β范围EEG-EMG同步的影响。我们同时记录了10名健康受试者在维持8%的运动收缩任务中对侧感觉运动区的皮层电活动（EEG）和指浅屈肌的表面肌电图（EMG）活动。最大随意收缩（MVC）力水平。计算了EEG和EMG中振荡过程之间的相干性。研究了三种不同的条件：（i）执行高精度任务（HP）;（ii）执行高精度任务并同时执行心算任务（HPAT），即注意力在运动任务和心算任务之间分配;（iii）执行低精度任务（LP）。我们已经发现，当注意力在运动任务和心算任务之间分配时，β范围EEG-EMG同步的量降低到95%置信水平以下。结果还表明，β范围同步的频率更高，精度更高，但仍然在β频率范围内（15-30 Hz）。结论：数据表明，β范围同步代表了一种状态的皮质-肌肉网络时，注意力指向运动任务。该网络的同步频率与。并可能进行编码，精确地产生力量。(C)2002爱思唯尔科学爱尔兰有限公司保留所有权利。
Objective: The present study was aimed at investigating the effect of attention and precision level of exerted force on beta range EEG-EMG synchronization.Methods: We simultaneously recorded cortical electrical activity (EEG) in a bipolar manner from the contralateral sensorimotor areas and surface electromyographic (EMG) activity from the flexor digitorum superficialis muscle in 10 healthy subjects during a maintained motor contraction task at 8% of the maximal voluntary contraction (MVC) force level. The coherence between oscillatory processes in the EEG and EMG was calculated. Three different conditions were investigated: (i) performing the task with high precision (HP); (ii) performing the task with high precision and simultaneously performing a mental arithmetic task (HPAT), i.e. attention was divided between the motor task and the mental arithmetic task; and (iii) performing the task with low precision (LP).Results: We have found that the amount of beta range EEG-EMG synchronization decreases below the 95% confidence level when attention is divided between the motor task and the mental arithmetic task. The results also show that the frequency of beta range synchronization is higher with a higher level of precision but still lies within the beta frequency range (15-30 Hz).Conclusions: The data indicate that beta range synchronization represents a state of the cortico-muscular network when attention is directed towards the motor task. The frequency of synchronization of this network is associated with. and possibly encodes, precision in force production. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.