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首页> 外文期刊>The Journal of Experimental Biology >Locomotor corollary activation of trigeminal motoneurons: coupling of discrete motor behaviors
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Locomotor corollary activation of trigeminal motoneurons: coupling of discrete motor behaviors

机译：三叉运动神经元的运动推论激活：离散运动行为的耦合。

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During motor behavior, corollary discharges of the underlying motor commands inform sensory-motor systems about impending or ongoing movements. These signals generally limit the impact of self-generated sensory stimuli but also induce motor reactions that stabilize sensory perception. Here, we demonstrate in isolated preparations of Xenopus laevis tadpoles that locomotor corollary discharge provokes a retraction of the mechanoreceptive tentacles during fictive swimming. In the absence of sensory feedback, these signals activate a cluster of trigeminal motoneurons that cause a contraction of the tentacle muscle. This corollary discharge encodes duration and strength of locomotor activity, thereby ensuring a reliable coupling between locomotion and tentacle motion. The strict phase coupling between the trigeminal and spinal motor activity, present in many cases, suggests that the respective corollary discharge is causally related to the ongoing locomotor output and derives at least in part from the spinal central pattern generator; however, additional contributions from midbrain and/or hindbrain locomotor centers are likely. The swimming-related retraction might protect the touch-receptive Merkel cells on the tentacle from sensory over-stimulation and damage and/or reduce the hydrodynamic drag. The intrinsic nature of the coupling of tentacle retraction to locomotion is an excellent example of a context-dependent, direct link between otherwise discrete motor behaviors.
机译：在运动行为期间，基础运动命令的推论放电会通知感觉运动系统即将发生或正在进行的运动。这些信号通常会限制自我产生的感觉刺激的影响，但也会诱发使感觉知觉稳定的运动反应。在这里，我们证明在非洲爪蟾t的分离制剂中，运动性推论放电会在虚构的游泳过程中引起机械感受性触角的回缩。在没有感觉反馈的情况下，这些信号激活三叉运动神经元簇，引起触手肌肉收缩。该推论放电编码运动活动的持续时间和强度，从而确保运动和触手运动之间的可靠耦合。在许多情况下，三叉神经和脊柱运动活动之间存在严格的相位耦合，这表明相应的推论放电与正在进行的运动输出有因果关系，并且至少部分源自脊柱中央模式发生器。但是，中脑和/或后脑运动中心可能会做出其他贡献。游泳相关的收缩可能保护触手上的接触性默克尔细胞免受感觉过度刺激和损害，和/或减少流体动力阻力。触手缩回与运动耦合的内在本质是在其他情况下离散的运动行为之间依赖于上下文的直接联系的一个很好的例子。

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