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首页> 外文期刊>Journal of Neurophysiology >Stochastic resonance in the motor system: effects of noise on the monosynaptic reflex pathway of the cat spinal cord.
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Stochastic resonance in the motor system: effects of noise on the monosynaptic reflex pathway of the cat spinal cord.

机译：运动系统中的随机共振：噪声对猫脊髓的单突触反射路径的影响。

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In sensory systems, the presence of a particular nonzero level of noise may significantly enhance the ability of an individual to detect weak sensory stimuli through a phenomenon known as stochastic resonance (SR). The aim of this study was to demonstrate if such phenomenon is also exhibited by the motor system; in particular, in the Ia-motoneuron synapse of the cat spinal cord. Monosynaptic reflexes elicited by periodic electrical stimulation to the medial gastrocnemius nerve were recorded in the L(7) ventral root (or in single motoneurons) of decerebrated cats. Random stretches (mechanical noise) were applied to the lateral gastrocnemius plus soleus muscle by means of a closed-loop mechanical stimulator-transducer. In all cats, we observed the SR phenomenon. The amplitude of the monosynaptic reflexes (or number of action potentials recorded in the motoneurons) evoked by the weak electrical stimuli applied to the medial gastrocnemius nerve were an inverted U-like function of the mechanical noise applied to the lateral gastrocnemius plus soleus muscle. A significant maximum value in the amplitude of the monosynaptic responses was reached with a particular noise amplitude value. Numerical simulations on a model of the monosynaptic reflex pathway qualitatively reproduce this stochastic resonance behavior. We conclude that the monosynaptic reflex response elicited by Ia afferents is optimized by the noisy stretching of a synergistic muscle. Our study provides the first direct demonstration that the motor system, and not only the sensory systems, exhibits the SR phenomenon.
机译：在感觉系统中，特定的非零噪声水平的存在可能会通过称为随机共振（SR）的现象显着增强个人检测微弱的感觉刺激的能力。这项研究的目的是证明电机系统是否也表现出这种现象。特别是在猫脊髓的Ia-运动神经元突触中。定期电刺激内侧腓肠神经引起的单突触反射记录在去脑猫的L（7）腹侧根（或单个运动神经元）中。通过闭环机械刺激器-换能器对腓肠肌外侧和比目鱼肌进行随机拉伸（机械噪声）。在所有猫中，我们都观察到了SR现象。施加于腓肠肌内侧的弱电刺激引起的单突触反射的振幅（或运动神经元中记录的动作电位的数量）是施加于腓肠肌外侧和比目鱼肌的机械噪声的倒U型功能。在特定的噪声振幅值下，单突触响应的振幅达到了明显的最大值。在单突触反射路径模型上的数值模拟定性地再现了这种随机共振行为。我们得出的结论是，由Ia传入引起的单突触反射反应是通过协同肌肉的噪声拉伸而优化的。我们的研究首次直接证明了电机系统，不仅是感觉系统，都表现出SR现象。

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