Startle evokes nearly identical movements in multi-jointed, two-dimensional reaching tasks.
Startle evokes nearly identical movements in multi-jointed, two-dimensional reaching tasks.
复制标题
在多关节、二维触及任务中，惊吓会引起几乎相同的动作。
DOI：
10.1007/s00221-018-5399-8
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发表时间：
2019
影响因子：
2
通讯作者：
Honeycutt,ClaireF
中科院分区：
文献类型：
--
作者：
Ossanna,MeilinR;Zong,Xi;Ravichandran,VengateswaranJ;Honeycutt,ClaireF
StartReact是惊吓反射在存在大声的声学刺激的情况下不自主地释放计划运动的能力，导致肌肉活动模式和运动学被严格调节并与预期动作成比例。先前的研究证明了startReact在简单的单关节到达任务中的鲁棒性，并且发现startReact和自愿运动之间的运动学和肌肉激活模式没有差异。然而，startReact尚未在具有多个自由度的多关节伸展运动期间进行评估。目前还不清楚startReact是否会在不受限制的工作空间中引起准确和精确的多关节伸展运动。此外，如果进行更严格的测试，多关节startReact运动学和肌肉激活模式可能并不真正等同，尽管通过传统的ANOVA没有显示出差异。之前的一项研究发现，在肘部和肩部不受限制地运动时，多关节startReact是可能的。因此，我们假设，与多方向工作空间中的自主运动相比，startReact会引起类似的多关节伸展运动，以获得运动准确性和肌肉激活模式。在以前的研究基础上，我们的研究使用了更大的工作空间，并充分评估了运动运动学和肌肉激活模式。结果证实了我们的假设，并发现startReact运动很容易在各个方向诱发。StartReact反应呈现出典型的早期肌肉激活，但startReact和自主运动之间激动剂/拮抗剂放电对的相对时间保持相似。结果表明，startReact在多关节接触任务中是鲁棒的，并且具有评估健康和受损运动的潜在临床用途。
StartReact is the ability of the startle reflex to involuntarily release a planned movement in the presence of a loud acoustic stimulus resulting in muscle activity patterns and kinematics that are tightly regulated and scaled with the intended action. Previous studies demonstrated startReact’s robustness during simple single-joint reaching tasks and found no difference between startReact and voluntary movements for movement kinematics and muscle activation patterns. However, startReact has not been evaluated during multi-joint reaching movements with multiple degrees of freedom. It is unclear if startReact would evoke accurate and precise multi-joint reaching movements in an unrestricted workspace. Furthermore, if tested more rigorously, multi-joint startReact movement kinematics and muscle activation patterns might not be truly equivalent despite showing no difference through traditional ANOVAs. A previous study found multi-joint startReact was possible during unrestricted elbow and shoulder movement when reaching to a forward target. Therefore, we hypothesized that startReact would evoke similar multi-joint reaching movements for movement accuracy and muscle activation patterns when compared to voluntary movements in a multi-directional workspace. Expanding upon the previous study, our study uses a larger workspace and fully evaluates movement kinematics and muscle activations patterns. Results confirmed our hypothesis and found startReact movements were readily evoked in all directions. StartReact responses presented stereotypically earlier muscle activation, but the relative timing of agonist/antagonist firing pairs between startReact and voluntary movements remained similar. Results demonstrate that startReact is robustly present and equivalent in multi-joint reaching tasks and has potential clinical use for evaluating healthy and impaired movement.