Desrochers Phillip C, Brunfeldt Alexander T, Kagerer Florian A
Department of Kinesiology, Michigan State University, East Lansing, MI 48824, USA.
Department of Kinesiology, Michigan State University, East Lansing, MI 48824, USA; Neuroscience Program, Michigan State University, East Lansing, MI 48824, USA.
Neuroscience. 2020 Apr 15;432:30-43. doi: 10.1016/j.neuroscience.2020.01.044. Epub 2020 Feb 7.
In this study, we investigated brain dynamics during interference between hands during bimanual movements. Participants performed a bimanual center-out reaching task in which a visuomotor rotation was applied to the right hand while the left hand did not receive visual feedback of its movements. This manipulation resulted in interference from the adapting right hand to the kinesthetically guided left hand. Electroencephalography (EEG) recordings during the task showed that spectral power in the high and low beta frequency bands was elevated early in exposure, but decreased throughout learning. This may be representative of error-based updating of internal models of movement. Additionally, coherence, a measure of neural functional connectivity, was elevated both within and between hemispheres in the beta frequencies during the initial presentation of the visuomotor rotation, and then decreased throughout adaptation. This suggests that beta oscillatory neural activity may be marker for transmission of conflicting motor information between hemispheres, which manifests in interference between the hands during asymmetrical bimanual movements.
在本研究中，我们调查了双手在进行双手协调运动时相互干扰期间的脑动力学。参与者执行了一项双手向中心伸出的任务，其中对右手施加了视觉运动旋转，而左手没有收到其运动的视觉反馈。这种操作导致适应中的右手对通过动觉引导的左手产生干扰。任务期间的脑电图（EEG）记录表明，在暴露初期，高、低β频段的频谱功率升高，但在整个学习过程中降低。这可能代表基于误差的运动内部模型更新。此外，作为神经功能连接性度量的相干性，在视觉运动旋转初次呈现期间，β频率在半球内和半球间均升高，然后在整个适应过程中降低。这表明β振荡神经活动可能是半球间冲突运动信息传递的标志，这在不对称双手运动期间双手的干扰中表现出来。
