Hirano Daisuke, Wada Misaki, Kimura Naotoshi, Jinnai Daisuke, Goto Yoshinobu, Taniguchi Takamichi
Graduate School of Health and Welfare Sciences, International University of Health and Welfare, 4-1-26 Akasaka, Minato, Tokyo, 107-8402, Japan.
Department of Occupational Therapy, School of Health Sciences, International University of Health and Welfare, 2600-1 Kitakanemaru, Otawara, Tochigi, 324-8501, Japan.
Heliyon. 2024 Jul 4;10(13):e34126. doi: 10.1016/j.heliyon.2024.e34126. eCollection 2024 Jul 15.
Dual-tasking is defined as performing two or more tasks concurrently. This study aimed to investigate the effect of divided attention on movement-related cortical potential (MRCP) during dual-task performance in 11 community-dwelling elderly individuals while the load of the secondary task was altered. MRCP was recorded during a single task (ST), simple dual task (S-DT), and complex dual task (C-DT) as no-, low-, and high-load divided attention tasks, respectively. The ST involved self-paced tapping with an extended right index finger. In the S-DT and C-DT, the subjects simultaneously performed the ST and a visual number counting task with different levels of load. The coefficient of variation of movement frequency was significantly more variable in the C-DT than in the ST. The MRCP amplitude from electroencephalography electrode C3, contralateral to the moving hand, was significantly higher in the C-DT than in the ST. Higher attention diversion led to a significant reduction in MRCP amplitude in the participants. These results suggest that attention division in dual-task situations plays an important role in movement preparation and execution. We propose that MRCP can serve as a marker for screening the ability of older individuals to perform dual-tasks.
多任务处理被定义为同时执行两项或更多任务。本研究旨在调查11名社区居住的老年人在多任务执行过程中，当第二项任务的负荷改变时，注意力分散对运动相关皮层电位（MRCP）的影响。分别在单任务（ST）、简单多任务（S-DT）和复杂多任务（C-DT）期间记录MRCP，将其作为无负荷、低负荷和高负荷注意力分散任务。ST包括用伸出的右手食指自定节奏地轻敲。在S-DT和C-DT中，受试者同时执行ST和具有不同负荷水平的视觉数字计数任务。与ST相比，C-DT中运动频率的变异系数变化显著更大。来自与运动手对侧的脑电图电极C₃的MRCP振幅在C-DT中显著高于ST。更高的注意力分散导致参与者的MRCP振幅显著降低。这些结果表明，多任务情况下的注意力分配在运动准备和执行中起重要作用。我们提出，MRCP可作为筛查老年人执行多任务能力的一个指标。
