Centre for Brain and Mind, Department of Psychology, University of Western Ontario, London, ON, Canada.
Cortex. 2012 Nov-Dec;48(10):1342-50. doi: 10.1016/j.cortex.2011.09.007. Epub 2011 Sep 28.
The goal of this study was to determine how handedness and lifting hand influence the way in which we lift objects and perceive their weights. To this end, we examined the fingertip forces and perceptual judgements of 30 left-handers and 30 right-handers during lifts of specially constructed 'size-weight illusion' (SWI) cubes with their left and right hands. All participants completed a series of lifts first with one hand and then the other, so we could additionally examine asymmetries in the retention and transfer of force information between the limbs. Right-handers experienced a larger illusion with their left hand than they did with their right hand, whereas left-handers showed no such asymmetry in their illusions. The perceptual illusion's independence from the application of fingertip force was highlighted by an unexpected lack of asymmetry in terms of fingertip force scaling. Left- and right-handers showed no dominant hand advantage in this task - they were no more skilled at correcting their fingertip force errors with their preferred hand than they were with their non-preferred hand. In addition, although no asymmetries were observed with regard to the most efficient direction of intermanual transfer, the right-handed individuals transferred force information between the hands more effectively than the left-handers. Overall, these findings indicate that hand dominance does not affect the control of the fingertip forces, suggesting that existing models of cerebral laterality must be re-visited to consider kinetic (i.e., related to forces), as well as kinematic (i.e., related to movement) variables.
本研究旨在确定利手和提举手如何影响我们提起物体和感知其重量的方式。为此，我们检查了 30 名左利手和 30 名右利手在使用其左手和右手提起特制的“大小重量错觉”（SWI）立方体时的指尖力和知觉判断。所有参与者都先使用一只手完成了一系列提升，然后再用另一只手完成，因此我们可以进一步研究力信息在肢体之间的保留和转移中的不对称性。右利手用左手感受到的错觉比用右手大，而左利手在他们的错觉中没有表现出这种不对称性。指尖力缩放方面出乎意料的缺乏不对称性突出了知觉错觉的独立性。左利手和右利手在这项任务中都没有优势手，他们用惯用手纠正指尖力误差的能力并不比非惯用手强。此外，尽管在最有效的双手间力转移方向上没有观察到不对称性，但右利手个体在双手之间传递力信息的效率高于左利手个体。总的来说，这些发现表明利手优势并不影响指尖力的控制，这表明现有的大脑偏侧性模型必须重新考虑，以考虑动力学（即与力相关）和运动学（即与运动相关）变量。
