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首页> 美国卫生研究院文献>The Journal of Neuroscience >Individual Premotor Drive Pulses Not Time-Varying Synergies Are the Units of Adjustment for Limb Trajectories Constructed in Spinal Cord
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Individual Premotor Drive Pulses Not Time-Varying Synergies Are the Units of Adjustment for Limb Trajectories Constructed in Spinal Cord

机译：单个前电动机驱动脉冲而非时变协同作用是调节脊髓中肢体运动轨迹的调整单位

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Complex actions may arise by combining simple motor primitives. Our studies support individual premotor drive pulses or bursts as execution primitives in spinal cord. Alternatively, the fundamental execution primitives at the segmental level could be time-varying synergies. To distinguish these hypotheses, we examined sensory feedback effects during targeted wiping organized in spinal cord. This behavior comprises three bursts. We tested (1) whether feedback altered the structure of individual premotor drive bursts or primitives, and (2) whether feedback differentially modulated different drive bursts or pulses in the three burst sequence. At least two of the three bursts would need to always be comodulated to support a time-varying synergy. We used selective muscle vibration to control spindle feedback from a single muscle (biceps/iliofibularis). The structures of premotor drive bursts were conserved. However, biceps vibration (1) scaled the amplitudes of two bursts coactivated during the initial phase of wiping independently of one another without altering their phase, and (2) independently phase regulated the third burst but preserved its amplitude. Thus, all three bursts were regulated separately. Durations were unaffected. The independent effects depended on (1) time of vibration during wiping, (2) frequency of vibration, and (3) limb configuration. Because each of the three bursts was independently modulated, these data strongly support execution using individual premotor bursts rather than time-varying synergies at the spinal level of motor organization. Our data show that both sensory feedback and central systems of the spinal cord act in concert to adjust the individual premotor bursts in support of the straight and unimodal wiping trajectory.
机译：通过组合简单的电机原语可能会产生复杂的动作。我们的研究支持单个运动前驱动脉冲或爆发作为脊髓中的执行原语。或者，分段级别的基本执行原语可以是随时间变化的协同作用。为了区分这些假设，我们检查了脊髓组织性靶向擦拭过程中的感觉反馈效应。此行为包括三个突发。我们测试了（1）反馈是否改变了单个前置电机驱动脉冲或原语的结构，以及（2）反馈是否在三个脉冲序列中差分调制了不同的驱动脉冲或脉冲。三个脉冲串中的至少两个脉冲串需要始终进行协调以支持随时间变化的协同作用。我们使用选择性的肌肉振动来控制来自单个肌肉（二头肌/腓肠肌）的纺锤体反馈。前电机驱动脉冲的结构是保守的。但是，二头肌振动（1）缩放了在擦拭初始阶段相互激活的两个猝发的幅度，彼此独立而没有改变它们的相位；（2）独立地调节了第三次猝发的相位，但保持了其幅度。因此，所有三个突发分别被调节。持续时间不受影响。独立的效果取决于（1）擦拭时的振动时间，（2）振动频率和（3）肢体结构。因为三个脉冲中的每个脉冲都是独立调制的，所以这些数据强烈支持使用单个运动前脉冲来执行，而不是在运动组织的脊柱水平上随时间变化的协同作用。我们的数据表明，脊髓的感觉反馈和中央系统均起协调作用，以调节单​​个运动前突增，以支持笔直和单峰的擦拭轨迹。

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