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首页> 外文期刊>Experimental Brain Research >Do you know where your arm is if you think your head has moved?
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Do you know where your arm is if you think your head has moved?

机译：如果您认为头部已经移动，您知道手臂在哪里吗？

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摘要

Reproduction of a previously presented elbow position is affected by changes in head position. As movement of the head is associated with local biomechanical changes, the aim of the present study was to determine if illusory changes in head position could induce similar effects on the reproduction of elbow position. Galvanic vestibular stimulation (GVS) was applied to healthy subjects in supine lying. The stimulus was applied during the presentation of an elbow position, which the subject then reproduced without stimulation. In the first study, 13 subjects received 1.5 mA stimuli, which caused postural sway in standing, confirming that the firing of vestibular afferents was affected, but no illusory changes in head position were reported. In the second study, 13 subjects received 2.0–3.0 mA GVS. Six out of 13 subjects reported consistent illusory changes in head position, away from the side of the anode. In these subjects, anode right stimulation induced illusory left lateral flexion and elbow joint position error towards extension (p=0.03), while anode left tended to have the opposite effect (p=0.16). The GVS had no effect on error in subjects who did not experience illusory head movement with either 1.5 mA stimulus (p=0.8) or 2.0–3.0 mA stimulus (p=0.7). This study demonstrates that the accuracy of elbow repositioning is affected by illusory changes in head position. These results support the hypothesis that the perceived position of proximal body segments is used in the planning and performance of accurate upper limb movements.
机译：先前显示的肘部位置的再现受头部位置的变化影响。由于头部的运动与局部生物力学变化有关，所以本研究的目的是确定头部位置的虚幻变化是否可以对肘部位置的再生产生类似的影响。电流前庭刺激（GVS）应用于仰卧躺的健康受试者。在肘部位置出现期间施加刺激，然后受试者无刺激地繁殖。在第一项研究中，有13位受试者受到1.5 mA刺激，导致站立时的姿势摇摆，证实前庭传入的射击受到影响，但未报告头部虚假变化。在第二项研究中，有13位受试者接受了2.0–3.0 mA GVS。 13名受试者中有6名报告了头部位置的幻觉变化一致，远离阳极一侧。在这些受试者中，阳极右侧刺激引起错觉的左侧横向屈曲和肘关节向伸展的位置误差（p = 0.03），而阳极左侧趋向于产生相反的效果（p = 0.16）。对于没有经历1.5 mA刺激（p = 0.8）或2.0–3.0 mA刺激（p = 0.7）幻觉的头部运动的受试者，GVS对错误没有影响。这项研究表明，肘部重新定位的准确性受头部错觉变化的影响。这些结果支持这样的假说：近端身体部分的感知位置用于精确的上肢运动的计划和执行中。

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