Speed accuracy trade-off, the inverse relationship between movement speed and task accuracy, is a ubiquitous feature of skilled motor performance. Many previous studies have focused on the dominant arm, unimanual performance in both simple tasks, such as target reaching, and complex tasks, such as overarm throwing. However, while handedness is a prominent feature of human motor performance, the effect of limb dominance on speed-accuracy relationships is not well-understood. Based on previous research, we hypothesize that dominant arm skilled performance should depend on visual information and prior task experience, and that the non-dominant arm should show greater skill when no visual information nor prior task information is available. Forty right-handed young adults reached to 32 randomly presented targets across a virtual reality workspace with either the left or the right arm. Half of the participants received no visual feedback about hand position throughout each reach. Sensory information and task experience were lowest during the first cycle of exposure (32 reaches) in the no-vision condition, in which visual information about motion was not available. Under this condition, we found that the left arm group showed greater skill, measured in terms of position error normalized to speed, and by error variability. However, as task experience and sensory information increased, the right arm group showed substantial improvements in speed-accuracy relations, while the left arm group maintained, but did not improve, speed-accuracy relations throughout the task. These differences in performance between dominant and non-dominant arm groups during the separate stages of the task are consistent with complimentary models of lateralization, which propose different proficiencies of each hemisphere for different features of control. Our results are incompatible with global dominance models of handedness that propose dominant arm advantages under all performance conditions.

速度精度权衡，即运动速度和任务精度之间的反比关系，是熟练运动表现的普遍特征。之前的许多研究都集中在优势臂、简单任务（例如目标到达）和复杂任务（例如过臂投掷）中的单手表现。然而，虽然用手习惯是人类运动表现的一个突出特征，但肢体优势对速度-准确性关系的影响尚不清楚。根据之前的研究，我们假设优势臂的技能表现应该取决于视觉信息和先前的任务经验，并且当没有视觉信息或先前的任务信息可用时，非优势臂应该表现出更高的技能。 40 名惯用右手的年轻人用左臂或右臂到达虚拟现实工作空间中的 32 个随机呈现的目标。一半的参与者在每次伸展过程中都没有收到有关手部位置的视觉反馈。在无视觉条件下的第一个暴露周期（32 次）中，感觉信息和任务体验最低，此时无法获得有关运动的视觉信息。在这种情况下，我们发现左臂组表现出更高的技能，以标准化为速度的位置误差和误差变异性来衡量。然而，随着任务经验和感官信息的增加，右臂组在速度-准确度关系方面表现出显着改善，而左臂组在整个任务过程中保持但没有改善速度-准确度关系。 在任务的不同阶段中，主导臂组和非主导臂组之间的这些表现差异与偏侧化的互补模型一致，该模型提出每个半球对于不同控制特征的不同熟练程度。我们的结果与惯用手的全球优势模型不相容，该模型提出了在所有表现条件下的优势手臂优势。