Department of Health and Human Performance, University of Houston, 3855 Holman St., Garrison 104U, Houston, TX 77204-6015, USA.
Exp Brain Res. 2013 Apr;225(4):559-67. doi: 10.1007/s00221-012-3395-y. Epub 2013 Jan 10.
We investigated within- and between-hand grip and load force coordination in healthy young subjects during bimanual tasks involving realistic manual actions. Actions involving disparate actions of the two hands (bimanual asymmetry) were expected to result in lower overall measures of within- and between-hand measures of grip and load force coordination. As dissociation between two hands performing disparate actions may be expected, it was also hypothesized that increased task asymmetry would result in a shift toward higher within-hand force coordination. Features such as object rotation were found to reduce some, but not all indices of both within- and between-hand force coordination. The action of connecting two independent objects was associated with declines in all indices of within- and between-hand force coordination. Evidence of task-specific differences in force application timing and a trend toward within-hand grip-load coordination differences in the current data set suggest that individual hand specification emerges naturally in everyday bimanual prehension tasks, independent of the action role of the assigned to the dominant and non-dominant hands.
我们研究了健康年轻受试者在涉及现实手部动作的双手任务中，手部抓握力和负载力在手部内和手部间的协调情况。预计涉及双手不同动作（双手不对称）的动作会导致手部内和手部间抓握力和负载力协调的整体测量值降低。由于预期两只手执行不同动作会出现分离，因此还假设任务的不对称性增加会导致手部内力协调的增加。研究发现，物体旋转等特征会降低手部内和手部间力协调的一些但不是所有指标。连接两个独立物体的动作与手部内和手部间力协调的所有指标的下降有关。当前数据集的力施加时间的任务特异性差异的证据以及在手内抓握力-负载协调差异的趋势表明，个体手部指定在日常双手抓握任务中自然出现，而与分配给优势手和非优势手的动作角色无关。
