Constraints on Arm Selection Processes When Reaching: Degrees of Freedom and Joint Amplitudes Interact to Influence Limb Selection
Constraints on Arm Selection Processes When Reaching: Degrees of Freedom and Joint Amplitudes Interact to Influence Limb Selection
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DOI：
10.1080/00222895.2011.619222
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发表时间：
2011-01-01
影响因子：
1.4
通讯作者：
Gabbard, Carl
中科院分区：
文献类型：
--
作者：
Kim, Wondae;Buchanan, John;Gabbard, Carl
为了确定在伸手时限制手臂选择的变量，作者让 11 名惯用右手的参与者在 9 个物体位置上进行自由选择和指定肢体伸手操作。当右臂到达右半身 30 度和 40 度的位置时，100% 的时间都可以自由选择。然而，85% 的时间，左臂可以自由选择到达左半空间 -30 度和 -40 度的位置。自由肢体和指定肢体到达运动学之间的比较表明，到达最远位置时自由肢体的选择受到关节幅度要求和肢体减速时间的限制。当到达中线和 +/- 10 度的位置时，自由臂和指定臂的伸展之间的差异并不明显，尽管右臂最常被自由选择用于这些位置。不同的因素影响肢体选择，作为进入特定半空间的距离的函数。
With an interest in identifying the variables that constrain arm choice when reaching, the authors had 11 right-handed participants perform free-choice and assigned-limb reaches at 9 object positions. The right arm was freely selected 100% of the time when reaching to positions at 30 degrees and 40 degrees into right hemispace. However, the left arm was freely selected to reach to positions at -30 degrees and -40 degrees in left hemispace 85% of the time. A comparison between free-and assigned-limb reaching kinematics revealed that free limb selection when reaching to the farthest positions was constrained by joint amplitude requirements and the time devoted to limb deceleration. Differences between free-and assigned-arm reaches were not evident when reaching to the midline and positions of +/- 10 degrees, even though the right arm was freely selected most often for these positions. Different factors contribute to limb selection as a function of distance into a specific hemispace.