Amplitude and phase dynamics associated with acoustically paced finger tapping
Amplitude and phase dynamics associated with acoustically paced finger tapping
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DOI：
10.1016/j.brainres.2006.06.039
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发表时间：
2006-09-13
期刊：
影响因子：
2.9
通讯作者：
Beek, Pj.
中科院分区：
文献类型：
--
作者：
Boonstra, T. W.;Daffertshofer, A.;Beek, Pj.
为了深入了解与声起搏同步任务的性能相关的大脑活动，我们分析了脑磁图（MEG）信号在不同频带中固有的振幅和相位动态，以区分诱发和诱导反应。MEG信号相对于运动和听觉事件（敲击和音调起始）进行平均。主成分分析被用来比较振幅和相位的变化，在听，在起搏和非起搏敲击，允许分离的大脑活动相关的运动和听觉过程，分别。运动表现伴随着相位振幅变化和β频段锁相增加。听觉处理的声音刺激导致在θ和α波段的振幅和相位锁定的同时增加。与以往的研究听觉感知的时间重叠的听觉相关的振幅变化和相位锁定表示诱发反应。另一方面，β带中运动相关振幅和相位动力学的时间差异表明正在进行的大脑活动发生了变化，即，一种诱导反应，支持先前在β波段与运动相关的脑动力学结果。(c)2006 Elsevier B.V.保留所有权利。
To gain insight into the brain activity associated with the performance of an acoustically paced synchronization task, we analyzed the amplitude and phase dynamics inherent in magnetoencephalographic (MEG) signals across frequency bands in order to discriminate between evoked and induced responses. MEG signals were averaged with respect to motor and auditory events (tap and tone onsets). Principal component analysis was used to compare amplitude and phase changes during listening and during paced and unpaced tapping, allowing a separation of brain activity related to motor and auditory processes, respectively. Motor performance was accompanied by phasic amplitude changes and increased phase locking in the beta band. Auditory processing of acoustic stimuli resulted in a simultaneous increase of amplitude and phase locking in the theta and alpha band. The temporal overlap of auditory-related amplitude changes and phase locking indicated an evoked response, in accordance with previous studies on auditory perception. The temporal difference of movement-related amplitude and phase dynamics in the beta band, on the other hand, suggested a change in ongoing brain activity, i.e., an induced response supporting previous results on motor-related brain dynamics in the beta band. (c) 2006 Elsevier B.V. All rights reserved.