Kagerer Florian A
Department of Kinesiology/Neuroscience Program, Michigan State University, East Lansing, MI 48824, United States.
Neurosci Lett. 2015 Jan 1;584:33-8. doi: 10.1016/j.neulet.2014.10.002. Epub 2014 Oct 13.
Lateralized sensorimotor hand functions are often investigated separately or sequentially for each hand, e.g., in matching tasks, but rarely under more ecological circumstances where both hands move simultaneously. Using a novel bimanual paradigm in 21 young, healthy participants, this study addresses how postulated lateralized control processes of one hand influence control of the other hand across modalities. More specifically, in this paradigm one hand operates under visuomotor conditions, while the other hand receives no visual feedback and operates predominantly under kinesthetic control. Performance of the hand that does not receive visual feedback is compared between when moving alone (unimanual condition) and when moving together with the contralateral visually controlled hand (bimanual condition). Results suggest that during concurrent bimanual movements the 'invisible' hand benefits from specific control proficiencies of the 'visible' hand, indicating crossmodal and interhemispheric sharing of information that complements each hand's own strengths. These findings lend further support to a more differentiated view of functional lateralization of handedness.
对于每只手，通常会分别或依次研究其偏侧化的感觉运动手部功能，例如在匹配任务中，但很少在双手同时移动的更自然环境下进行研究。本研究采用一种新颖的双手范式，对21名年轻健康的参与者进行研究，探讨一只手假定的偏侧化控制过程如何跨模态影响另一只手的控制。更具体地说，在这种范式中，一只手在视觉运动条件下操作，而另一只手不接受视觉反馈，主要在动觉控制下操作。比较不接受视觉反馈的手在单独移动（单手条件）和与对侧视觉控制的手一起移动（双手条件）时的表现。结果表明，在同时进行的双手运动中，“不可见”的手受益于“可见”手的特定控制能力，这表明信息在跨模态和半球间共享，补充了每只手自身的优势。这些发现进一步支持了对手性功能偏侧化的更具差异化的观点。
