使用手部翻译视觉反馈进行训练后的双手间转移及本体感觉重新校准。

Intermanual transfer and proprioceptive recalibration following training with translated visual feedback of the hand.

作者信息

Mostafa Ahmed A, Salomonczyk Danielle, Cressman Erin K, Henriques Denise Y P

机构信息

Centre for Vision Research, York University, Toronto, ON, Canada.

出版信息

Exp Brain Res. 2014 Jun;232(6):1639-51. doi: 10.1007/s00221-014-3833-0. Epub 2014 Jan 28.

Abstract

Reaching with visual feedback that is misaligned with respect to the actual hand's location leads to changes in reach trajectories (i.e., visuomotor adaptation). Previous studies have also demonstrated that when training to reach with misaligned visual feedback of the hand, the opposite hand also partially adapts, providing evidence of intermanual transfer. Moreover, our laboratory has shown that visuomotor adaptation to a misaligned hand cursor, either translated or rotated relative to the hand, also leads to changes in felt hand position (what we call proprioceptive recalibration), such that subjects' estimate of felt hand position relative to both visual and non-visual reference markers (e.g., body midline) shifts in the direction of the visuomotor distortion. In the present study, we first determined the extent that motor adaptation to a translated cursor leads to transfer to the opposite hand, and whether this transfer differs across the dominant and non-dominant hands. Second, we looked to establish whether changes in hand proprioception that occur with the trained hand following adaptation also transfer to the untrained hand. We found intermanual motor transfer to the left untrained (non-dominant) hand after subjects trained their right (dominant) hand to reach with translated visual feedback of their hand. Motor transfer from the left trained to the right untrained hand was not observed. Despite finding changes in felt hand position in both trained hands, we did not find similar evidence of proprioceptive recalibration in the right or left untrained hands. Taken together, our results suggest that unlike visuomotor adaptation, proprioceptive recalibration does not transfer between hands and is specific only to the arm exposed to the distortion.

摘要

视觉反馈与实际手部位置不一致时进行伸手动作会导致伸手轨迹发生变化(即视运动适应)。以往研究还表明,当训练在手部视觉反馈不一致的情况下伸手时,对侧手也会出现部分适应,这为双手间的迁移提供了证据。此外,我们实验室的研究表明,对视运动适应于相对于手部平移或旋转的手部光标,也会导致手部感觉位置发生变化(我们称之为本体感觉重新校准),即受试者相对于视觉和非视觉参考标记(如身体中线)对手部感觉位置的估计会朝着视运动扭曲的方向偏移。在本研究中,我们首先确定了对平移光标进行运动适应导致对侧手出现迁移的程度,以及这种迁移在优势手和非优势手之间是否存在差异。其次,我们试图确定适应后训练手出现的手部本体感觉变化是否也会迁移到未训练手。我们发现,在受试者训练其右侧(优势)手在手部视觉反馈平移的情况下伸手后,运动迁移到了左侧未训练(非优势)手。未观察到从左侧训练手到右侧未训练手的运动迁移。尽管在两只训练手中都发现了手部感觉位置的变化,但我们在右侧或左侧未训练手中未发现类似的本体感觉重新校准证据。综上所述,我们的结果表明,与视运动适应不同,本体感觉重新校准不会在双手之间迁移,且仅特定于暴露于扭曲的手臂。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索