Proprioceptive localization of the left and right hands
Proprioceptive localization of the left and right hands
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DOI：
10.1007/s00221-009-2079-8
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发表时间：
2010-07-01
影响因子：
2
通讯作者：
Henriques, Denise Y. P.
中科院分区：
文献类型：
--
作者：
Jones, Stephanie A. H.;Cressman, Erin K.;Henriques, Denise Y. P.
本研究使用两种范例检查了手本体感觉定位的准确性。在我们的本体感觉估计范例中，参与者判断目标手相对于视觉参考或身体中线的位置。目标手的放置是主动的（参与者沿着受限路径推动机器人操作器）或被动的（机器人操作器定位参与者的目标手）。在我们的本体感受引导的伸手范式中，参与者伸到了一只手看不见的位置；左手和右手都充当目标手和到达手。在这两种范式中，受试者相对擅长估计每只手的位置（即相对于参考标记或使用触及范围），方向误差落在实际目标位置的 2 厘米以内，并且整个工作空间的变化很小。在我们的本体感觉估计范式中，目标手被动放置时的偏差不大于目标手主动放置时的偏差。参与者认为他们的左手比实际更偏左，右手比实际更偏右，但目标手之间的误差幅度相似。在我们的伸手范式中，参与者对左手位置的估计比对右手位置的估计向左偏差更大，但在两只手上显示出较小但相似的位置相关伸手误差模式。两只手之间的估计精度没有差异，也没有随任一范式的目标位置而变化。
The present study examined the accuracy of proprioceptive localization of the hand using two paradigms. In our proprioceptive estimation paradigm, participants judged the position of a target hand relative to visual references, or their body's midline. Placement of the target hand was active (participants pushed a robot manipulandum along a constrained path) or passive (the robot manipulandum positioned participants' target hand). In our proprioceptive-guided reaching paradigm, participants reached to the unseen location of a hand; both the left and right hands served as the target hand and the reaching hand. In both paradigms, subjects were relatively good at estimating the location of each hand (i.e. relative to a reference marker or using a reach), with directional errors falling within 2 cm of the actual target location, and little variation across the workspace. In our proprioceptive estimation paradigm, biases when the target hand was passively placed were no larger than those made when the target hand was actively placed. Participants perceived their left hand to be more to the left than it actually was, and their right hand to be more rightward than it actually was, but with a similar error magnitude across target hands. In our reaching paradigm, participants' estimates of left hand location were deviated more leftwards than their estimates of right hand location, but showed a small but similar pattern of location-dependent reach errors across the two hands. Precision of estimates did not differ between the two hands or vary with target location for either paradigm.