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首页> 外文期刊>Journal of Neurophysiology >Done in 100 ms: path-dependent visuomotor transformation in the human upper limb
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Done in 100 ms: path-dependent visuomotor transformation in the human upper limb

机译：在100毫秒中完成：人类上肢的路径依赖性求解器转换

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A core assumption underlying mental chronometry is that more complex tasks increase cortical processing, prolonging reaction times. In this study we show that increases in task complexity alter the magnitude, rather than the latency, of the output for a circuit that rapidly transforms visual information into motor actions. We quantified visual stimulus-locked responses (SLRs), which are changes in upper limb muscle recruitment that evolve at a fixed latency similar to 100 ms after novel visual stimulus onset. First, we studied the underlying reference frame of the SLR by dissociating the initial eye and hand position. Despite its quick latency, we found that the SLR was expressed in a hand-centric reference frame, suggesting that the circuit mediating the SLR integrated retinotopic visual information with body configuration. Next, we studied the influence of planned movement trajectory, requiring participants to prepare and generate either curved or straight reaches in the presence of obstacles to attain the same visual stimulus location. We found that SLR magnitude was influenced by the planned movement trajectory to the same visual stimulus. On the basis of these results, we suggest that the circuit mediating the SLR lies in parallel to other well-studied corticospinal pathways. Although the fixed latency of the SLR precludes extensive cortical processing, inputs conveying information relating to task complexity, such as body configuration and planned movement trajectory, can preset nodes within the circuit underlying the SLR to modulate its magnitude.
机译：核心假设潜在的精神上性编程是更复杂的任务增加了皮质加工，延长了反应时间。在这项研究中，我们表明任务复杂性的增加改变了快速将视觉信息转换为电机动作的电路输出的幅度，而不是延迟。我们量化了视觉刺激锁定的响应（SLR），其上肢肌肉募集的变化，其在新颖的视觉刺激后在类似于100ms的固定延迟时演变。首先，我们通过解散初始眼睛和手势来研究SLR的基础参考框架。尽管它快速延迟，我们发现SLR以一种以手为中心的参考帧表示，表明电路调解SLR集成的视网膜旋转视觉信息与车身配置。接下来，我们研究了计划运动轨迹的影响，要求参与者在存在障碍物的情况下准备和产生弯曲或直接到达以获得相同的视觉刺激位置。我们发现，单反幅度受计划运动轨迹的影响，以相同的视觉刺激。在这些结果的基础上，我们建议将SLR调解的电路平行于其他研究的皮质脊柱途径。尽管SLR的固定等待时间排除了广泛的皮质处理，但是输入与任务复杂性的传达信息，例如身体配置和计划的运动轨迹，可以预设在SLR下面的电路内的节点以调制其幅度。

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