The illusion of changed position and movement from vibrating one arm is altered by vision or movement of the other arm
The illusion of changed position and movement from vibrating one arm is altered by vision or movement of the other arm
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DOI：
10.1113/jphysiol.2010.192336
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发表时间：
2010-08-01
影响因子：
5.5
通讯作者：
Homma, Ikuo
中科院分区：
文献类型：
--
作者：
Izumizaki, Masahiko;Tsuge, Mikio;Homma, Ikuo
在被蒙住双眼的受试者身上进行了实验，以研究在前臂位置匹配任务中来自双臂的本体感觉输入的贡献。当受试者可以看到他们的指示器(匹配)手臂时，当他们使用虚拟手臂进行匹配时，当他们看着匹配手臂的镜像时，被蒙住眼睛的匹配准确率与准确率进行了比较。镜子的位置已经安排好，使指示臂的图像与参照臂的位置一致。这些条件都没有显著改变匹配误差。当参考肘屈肌以70-80赫兹的频率振动时，被蒙住眼睛的受试者报告的振动臂伸展的错觉通过指示臂的镜像视觉或使用虚拟手臂时显著减少。结论是，有关指示臂位置或参照臂的表观位置的视觉信息可以减小由振动引起的动觉错觉的大小，但不能消除它。在第二个实验中，受试者通过用振动的手臂追踪肘屈肌振动引起的前臂伸展错觉。研究发现，通过将指示器移动到伸展状态可以降低感觉到的伸展速度，而将指示器移动到屈曲状态可以提高感觉到的伸展速度。这些实验证明了指示器臂提供的输入匹配过程的重要性。这样的结论可能有助于解释使用单臂和双臂任务在位置感觉上观察到的一些明显的差异。更广泛地说，这篇论文支持这样的观点，即来自两个手臂的本体感觉输入的各个方面是共同处理的，作为在某些熟练任务中将双手作为单一工具使用的策略的一部分。
Experiments were carried out on blindfolded human subjects to study the contribution of proprioceptive inputs from both arms in a forearm position matching task. Blindfolded matching accuracy was compared with accuracy when the subject could see their indicator (matching) arm, when they used a dummy arm for matching, and when they looked at a mirror image of the matching arm. The position of the mirror had been arranged so that the image of the indicator arm coincided with the position of the reference arm. None of these conditions significantly altered the matching errors. When reference elbow flexors were vibrated at 70-80 Hz, the illusion of extension of the vibrated arm reported by blindfolded subjects was significantly reduced by vision of the mirror image of the indicator arm or when using the dummy arm. It was concluded that visual information about the position of the indicator arm, or the apparent position of the reference arm, could reduce the size of the kinaesthetic illusion from vibration, but not abolish it. In a second experiment, subjects indicated, by tracking with their vibrated arm, the illusion of forearm extension evoked by elbow flexor vibration. It was found that the perceived speed of extension could be reduced by moving the indicator into extension and increased by moving it into flexion. These experiments demonstrate the importance for the matching process of the input provided by the indicator arm. Such a conclusion may help to explain some apparent discrepancies between observations made on position sense using one-arm and two-arm tasks. More broadly, this paper provides support for the idea that aspects of proprioceptive inputs from both arms are processed conjointly, as part of a strategy for use of the two hands as a single instrument in certain skilled tasks.