Effect of locomotor demands on cognitive processing
Effect of locomotor demands on cognitive processing
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DOI：
10.1038/s41598-019-45396-5
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发表时间：
2019-06-25
影响因子：
4.6
通讯作者：
Ferris, Daniel P.
中科院分区：
文献类型：
--
作者：
Bradford, J. Cortney;Lukos, Jamie R.;Ferris, Daniel P.
了解大脑动力学如何随着双重认知和运动任务而变化，可以提高我们对人类神经生理学的认识。本研究的主要目的是：（1）评估从头皮EEG中提取皮层电信号的可行性，同时进行持续的，体力要求高的双任务步行和（2）测试假设P300事件相关电位是如何受到步行体力消耗的影响。参与者在跑步机上走了一个小时，要么背着一个空的背包，要么背着一个装满体重40%的背包。在步行条件下，并在一个坐着的控制条件，受试者定期进行视觉古怪的任务。我们记录头皮脑电图和检查皮层电动力学时间锁定的目标刺激。事件相关电位分析表明，在长时间负重行走过程中提取可靠的信号是可行的。P300波幅在负重行走时比坐位时降低，但时间对任务没有影响。源水平的活动和频率分析表明，感觉运动，顶叶，扣带回脑区都有助于减少P300振幅在双任务步行。我们解释的结果作为支持的优先级皮层资源行走，导致较少的资源被定向到古怪的任务在双任务运动。
Understanding how brain dynamics change with dual cognitive and motor tasks can improve our knowledge of human neurophysiology. The primary goals of this study were to: (1) assess the feasibility of extracting electrocortical signals from scalp EEG while performing sustained, physically demanding dual-task walking and (2) test hypotheses about how the P300 event-related potential is affected by walking physical exertion. Participants walked on a treadmill for an hour either carrying an empty rucksack or one filled with 40% of their body weight. During the walking conditions and during a seated control condition, subjects periodically performed a visual oddball task. We recorded scalp EEG and examined electrocortical dynamics time-locked to the target stimulus. Channel-level event-related potential analysis demonstrated that it is feasible to extract reliable signals during long duration loaded walking. P300 amplitude was reduced during loaded walking versus seated, but there was no effect of time on task. Source level activity and frequency analysis revealed that sensorimotor, parietal, and cingulate brain areas all contributed to the reduced P300 amplitude during dual-task walking. We interpret the results as supporting a prioritization of cortical resources for walking, leading to fewer resources being directed toward the oddball task during dual-task locomotion.