About the cortical origin of the low-delta and high-gamma rhythms observed in EEG signals during treadmill walking
About the cortical origin of the low-delta and high-gamma rhythms observed in EEG signals during treadmill walking
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DOI：
10.1016/j.neulet.2013.12.059
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发表时间：
2014-02-21
影响因子：
2.5
通讯作者：
Dutoit, Thierry
中科院分区：
文献类型：
--
作者：
Castermans, Thierry;Duvinage, Matthieu;Dutoit, Thierry
本文介绍了一个频谱和时频分析的EEG信号记录在7名健康受试者在跑步机上以三种不同的速度。将加速度计放置在受试者的头部，以记录行走期间EEG电极所经历的电击。我们的研究结果表明，高达15个谐波的基本步进频率可能会污染EEG信号，这取决于步行速度和电极位置。这一发现可能会质疑以前的EEG研究中得出的一些结论，其中低δ带（特别是1 Hz左右，基本步进频率）已被宣布为行走期间下肢的角度和线性运动学控制的所在地。此外，我们的分析表明，EEG和加速度计信号表现出相似的时间-频率特性，特别是在扩展到150 Hz的频带中，这表明先前声称在行走期间激活高伽马节律的结论可能是基于不充分清洁的EEG信号得出的。我们的研究结果与最近的EEG研究有关的运动和广泛的讨论，特别是集中在低δ和高γ波段。(C)2014爱思唯尔爱尔兰有限公司版权所有。
This paper presents a spectral and time-frequency analysis of EEG signals recorded on seven healthy subjects walking on a treadmill at three different speeds. An accelerometer was placed on the head of the subjects in order to record the shocks undergone by the EEG electrodes during walking. Our results indicate that up to 15 harmonics of the fundamental stepping frequency may pollute EEG signals, depending on the walking speed and also on the electrode location. This finding may call into question some conclusions drawn in previous EEG studies where low-delta band (especially around 1 Hz, the fundamental stepping frequency) had been announced as being the seat of angular and linear kinematics control of the lower limbs during walk. Additionally, our analysis reveals that EEG and accelerometer signals exhibit similar time-frequency properties, especially in frequency bands extending up to 150 Hz, suggesting that previous conclusions claiming the activation of high-gamma rhythms during walking may have been drawn on the basis of insufficiently cleaned EEG signals. Our results are put in perspective with recent EEG studies related to locomotion and extensively discussed in particular by focusing on the low-delta and high-gamma bands. (C) 2014 Elsevier Ireland Ltd. All rights reserved.