Position sense asymmetry.
Position sense asymmetry.
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DOI：
10.1007/s00221-008-1560-0
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发表时间：
2009-01
影响因子：
2
通讯作者：
Martin BJ
中科院分区：
文献类型：
--
作者：
Adamo DE;Martin BJ
上肢位置感的不对称性可以用左侧肢体优势来解释，这种优势来自于两半球在处理动觉信息方面的差异。然而，不清楚地理解与被动肢体位移相关联的感知信息和由执行运动命令产生的对应匹配运动的比较如何促成这些差异。在本研究中，上肢位置感进行了调查，在12个右手占主导地位的年轻人执行手腕位置匹配任务，不同的半球间转移，记忆提取和参考位置是否由相同或相反的肢体提供。右手和左手的绝对匹配误差是相似的参考和匹配位置时，由同一只手，但36%以上的参考位置匹配时，用另一只手。当检查由提供参考的同一只手所做的匹配运动产生的恒定误差时，右手和左手的匹配误差（± 3°）是相似的。然而，当与对侧肢体匹配时，当右手匹配左手参考时，大的过冲（P <0.05）表征了误差，而当左手匹配右手参考时，大的下冲（P <0.05）表征了误差。过冲和下冲的幅度相似（≈4°）。虽然不对称的本体感受信息，如大脑半球间的转移的中央处理可能存在，本研究表明，位置感的不对称主要是由于在“各自的本体感受感觉运动回路的增益”的差异。这一新的假设得到了代表右手和左手感觉运动系统以及形态和生理数据的双线性模型的有力支持。
Asymmetries in upper limb position sense have been explained in the context of a left limb advantage derived from differences in hemispheric specialization in the processing of kinesthetic information. However, it is not clearly understood how the comparison of perceptual information associated with passive limb displacement and the corresponding matching movement resulting from the execution of a motor command contributes to these differences. In the present study, upper limb position sense was investigated in 12 right-hand-dominant young adults performing wrist position matching tasks which varied in terms of interhemispheric transfer, memory retrieval and whether the reference position was provided by the same or opposite limb. Right and left hand absolute matching errors were similar when the reference and matching positions were produced by the same hand but were 36% greater when matching the reference position with the opposite hand. When examining the constant errors generated from matching movements made with the same hand that provided the reference, the right and left hand matching errors (≈3°) were similar. However, when matching with the opposite limb, a large overshoot (P <0.05) characterized the error when the right hand matched the left hand reference while a large undershoot (P <0.05) characterized the error when the left hand matched the right hand reference. The overshoot and undershoot were of similar magnitude (≈4°). Although asymmetries in the central processing of proprioceptive information such as inter-hemispheric transfer may exist, the present study suggests that asymmetries in position sense predominantly result from a difference in the “gain of the respective proprioceptive sensory-motor loops”. This new hypothesis is strongly supported by a dual-linear model representing the right and left hand sensory-motor systems as well as morphological and physiological data.