Department of Kinesiology, The Pennsylvania State University, 266 Recreation Building, University Park, PA 16802, USA.
Exp Brain Res. 2011 Feb;208(4):533-41. doi: 10.1007/s00221-010-2502-1. Epub 2010 Dec 4.
This study investigated the asymmetry of bilateral interference in a bimanual isometric force pulse task and the relation of the degree of interference with the asymmetry of the force levels and the hand dominance. One hand produced force pulses with the same peak force target, while the other hand produced different peak forces in blocked conditions with force target ratios between the hands that ranged from 1:1 to 16:1. There was asymmetric interference between the hands in that the hand performing the same peak forces showed stronger (i.e., higher bias and variable error) interference with the hand performing the different peak force than vice versa. The force-time properties also correlated more strongly when the different peak forces were generated by the left non-dominant than the right dominant hand. With increasing peak force ratios, the extent of interference became stronger and plateaued around the force ratio of 8:1 indicating a boundary condition to the asymmetric interference between hands. The results extend to bimanual isometric force control the dependence of bilateral asymmetric interference on task demands and hand dominance and provide further evidence on the degree of bilateral interference with task asymmetry.
这项研究调查了在双手等长力脉冲任务中双侧干扰的不对称性，以及干扰程度与力水平不对称性和手优势之间的关系。一只手产生具有相同峰值力目标的力脉冲，而另一只手在力目标比率为 1:1 到 16:1 的阻断条件下产生不同的峰值力。双手之间存在不对称干扰，即产生相同峰值力的手对产生不同峰值力的手的干扰更强（即更高的偏差和可变误差），反之亦然。当不同的峰值力由左手非优势手产生而不是右手优势手产生时，力-时间特性的相关性更强。随着峰值力比的增加，干扰程度变得更强，并在力比约为 8:1 时趋于平稳，这表明双手之间的不对称干扰存在一个边界条件。研究结果将双手等长力控制中的双侧不对称干扰依赖于任务需求和手优势的关系扩展，并提供了关于双边干扰与任务不对称性程度的进一步证据。
