Neuroplasticity and Motor Behavior Lab, Moss Rehabilitation Research Institute, Elkins Park, PA, United States of America; Department of Kinesiology, Whittier College, Science & Learning Center 304, Whittier, CA, United States of America.
Neuroplasticity and Motor Behavior Lab, Moss Rehabilitation Research Institute, Elkins Park, PA, United States of America.
Hum Mov Sci. 2024 Apr;94:103196. doi: 10.1016/j.humov.2024.103196. Epub 2024 Feb 24.
Perception of task goal influences motor performance and coordination. In bimanual actions, it is unclear how one's perception of task goals influences bimanual coordination and performance in individuals with unilateral stroke. We characterized inter-limb coordination differences in individuals with chronic right- and left-hemisphere damaged (RCVA: n = 24, LCVA: n = 24) stroke and age-matched neurotypical controls (n = 24) as they completed bimanual reaching tasks under distinct goal conditions. In the dual-goal condition, participants reached to move two virtual bricks (cursors) assigned to each hand toward independent targets. In the common-goal condition, they moved a central common virtual brick representing both hands to a single, central target. Spatial and temporal coordination (cross-correlation coefficients of hand velocity and their time-lag), the redundant axis deviations (the hand deviations in the axis orthogonal to the axis along the cursor-target direction), and the contribution ratio of the paretic hand were measured. Compared to the dual-goal condition, reaching actions to the common-goal demonstrated better spatial bimanual coordination in all three participant groups. Temporal coordination was better during common-goal than dual-goal actions only for the LCVA group. Additionally, and novel to this field, sex, as a biological variable, differently influenced movement time and redundant axis deviation in participants with stroke under the common-goal condition. Specifically, female stroke survivors showed larger movements in the redundant axes and, consequently, longer movement times, which was more prominent in the LCVA group. Our results indicate that perception of task goals influences bimanual coordination, with common goal improving spatial coordination in neurotypical individuals and individuals with unilateral stroke and providing additional advantage for temporal coordination in those with LCVA. Sex influences bimanual performance in stroke survivors and needs to be considered in future investigations.
任务目标的感知会影响运动表现和协调。在双手动作中,人们对于任务目标的感知如何影响单侧脑卒中患者的双手协调和表现还不清楚。我们对慢性右半球和左半球损伤(RCVA:n=24,LCVA:n=24)脑卒中患者以及年龄匹配的神经典型对照组(n=24)的肢体间协调差异进行了描述,这些患者在不同的目标条件下完成双手伸展任务。在双重目标条件下,参与者要将两只手的两个虚拟砖块(光标)移动到独立的目标上。在共同目标条件下,他们需要将一个中央共同虚拟砖块移动到一个单一的中央目标上。我们测量了空间和时间协调(手速度的互相关系数及其时滞)、冗余轴偏差(光标-目标方向上的轴的正交轴上的手偏差)以及健手的贡献比。与双重目标条件相比,在所有三个参与者组中,向共同目标的伸展动作表现出更好的空间双手协调。只有 LCVA 组在共同目标动作中,时间协调要好于双重目标动作。此外,作为一个生物学变量,性别在共同目标条件下对脑卒中患者的运动时间和冗余轴偏差有不同的影响,这在该领域是一个新发现。具体来说,女性脑卒中幸存者在冗余轴上的运动幅度更大,因此运动时间更长,在 LCVA 组中更为明显。我们的结果表明,任务目标的感知会影响双手协调,共同目标可以提高神经典型个体和单侧脑卒中患者的空间协调,并为 LCVA 患者提供额外的时间协调优势。性别会影响脑卒中幸存者的双手表现,在未来的研究中需要考虑这一因素。