Hirano Daisuke, Goto Yoshinobu, Jinnai Daisuke, Taniguchi Takamichi
Graduate School of Health and Welfare Sciences, International University of Health and Welfare: 4-1-26 Akasaka, Minato, Tokyo, Japan.
Department of Occupational Therapy, School of Health Sciences, International University of Health and Welfare, Japan.
J Phys Ther Sci. 2020 Nov;32(11):710-716. doi: 10.1589/jpts.32.710. Epub 2020 Nov 11.
[Purpose] The aim of this study was to investigate the effect of divided attention on motor-related cortical potential (MRCP) during dual task performance while the difficulty of the secondary task was altered. [Participants and Methods] Twenty-two right-handed healthy volunteers participated in the study. MRCPs were recorded during two tasks, a single task (ST) and a simple (S-DT) or complex dual task (C-DT). The ST involved a self-paced tapping task in which the participants extended their right index finger. In the dual task, the participants performed the ST and a visual number counting task simultaneously. [Results] The amplitude and integral value of MRCP from electroencephalography electrode C3 was significantly higher in the S-DT than in the ST, whereas they were similar between the C-DT and the ST. Medium-load divided attention (i.e., S-DT) led to significantly more changes in the MRCP magnitude than did low-load divided attention (i.e., ST). However, the MRCP of high-load divided attention (i.e., C-DT) was similar to that of low-load divided attention. [Conclusion] These results suggest that MRCP reflects the function of or network between the supplementary motor area and the dorsolateral prefrontal cortex, and may serve as a marker for screening the capacity of individuals to perform dual tasks.
[目的] 本研究旨在探讨在改变次要任务难度的情况下，双重任务执行过程中分散注意力对运动相关皮层电位（MRCP）的影响。[参与者与方法] 22名右利手健康志愿者参与了本研究。在两项任务中记录MRCP，一项是单任务（ST），另一项是简单（S-DT）或复杂双重任务（C-DT）。ST是一项自定节奏的敲击任务，参与者伸展右手食指。在双重任务中，参与者同时执行ST和视觉数字计数任务。[结果] 脑电图电极C3记录的MRCP的幅度和积分值在S-DT中显著高于ST，而在C-DT和ST之间相似。中等负荷的分散注意力（即S-DT）比低负荷的分散注意力（即ST）导致MRCP幅度的变化显著更多。然而，高负荷分散注意力（即C-DT）的MRCP与低负荷分散注意力的相似。[结论] 这些结果表明，MRCP反映了辅助运动区和背外侧前额叶皮层之间的功能或网络，并且可能作为筛选个体执行双重任务能力的一个标志物。
