Department of Neurology, Kawasaki Medical School, Okayama 701-0192, Japan; Department of Rehabilitation Medicine, The University of Tokyo Hospital, Tokyo 113-8655, Japan.
Department of Rehabilitation Medicine, The University of Tokyo Hospital, Tokyo 113-8655, Japan.
Neuroimage. 2023 Oct 15;280:120352. doi: 10.1016/j.neuroimage.2023.120352. Epub 2023 Aug 28.
Previous studies have suggested cortical involvement in postural control in humans by measuring cortical activities and conducting dual-task paradigms. In dual-task paradigms, task performance deteriorates and can be facilitated in specific dual-task settings. Theoretical frameworks explaining these dual-task interactions have been proposed and debated for decades. Therefore, we investigated postural control performance under different visual conditions using a virtual reality system, simultaneously measuring cortical activities with a functional near-infrared spectroscopy system. Twenty-four healthy participants were included in this study. Postural stability and cortical activities after perturbations were measured under several conditions consisting of postural and visual perturbations. The results showed that concurrent visual and postural perturbations could facilitate cortical activities in the supplementary motor area and superior parietal lobe. Additionally, visual distractors deteriorated postural control ability and cortical activation of the supplementary motor area. These findings supported the theoretical framework of the "Cross talk model", in which concurrent tasks using similar neural domains can facilitate these task performances. Furthermore, it indicated that the cortical resource capacity and domains activated for information processing should be considered in experiments involving dual-task paradigms and training.
先前的研究通过测量皮质活动和进行双重任务范式，提示了人类姿势控制中皮质的参与。在双重任务范式中，任务表现会恶化，并且在特定的双重任务设置中可以得到促进。几十年来，已经提出并讨论了用于解释这些双重任务相互作用的理论框架。因此，我们使用虚拟现实系统研究了不同视觉条件下的姿势控制性能，同时使用功能近红外光谱系统测量皮质活动。本研究纳入了 24 名健康参与者。在包括姿势和视觉扰动的几种条件下，测量了扰动后的姿势稳定性和皮质活动。结果表明，同时进行视觉和姿势扰动可以促进辅助运动区和顶叶上回的皮质活动。此外，视觉干扰物会降低姿势控制能力和辅助运动区的皮质激活。这些发现支持了“交叉对话模型”的理论框架，即使用类似的神经域的并行任务可以促进这些任务表现。此外，这表明在涉及双重任务范式和训练的实验中，应考虑皮质资源容量和用于信息处理的激活域。
