Wolf H, von Helversen O
J Comp Physiol A. 1986 Jun;158(6):861-71. doi: 10.1007/BF01324827.
In freely moving grasshoppers of the species Chorthippus biguttulus compound potentials were recorded from the neck connectives with chronically implanted hook electrodes. The spikes of one large auditory interneuron, known as the G-neuron (Kalmring 1975a, b) were clearly distinguishable in the recordings and the neuron was identified by its physiology and morphology. In quiescent grasshoppers the G-neuron responds to auditory and vibratory stimuli, but responses to both stimuli are suppressed during stridulation in males. When a male's wings were removed so that the stridulatory movements of its hindlegs produced no sound, the suppression of the G-neuron response still occurred. When proprioceptive feedback from the hindlegs was reduced, by forced autotomy of the legs, the switching-off remained incomplete (production of stridulatory patterns was inferred on the basis of electromyograms from the relevant thoracic musculature). Imposed movement of the hindlegs, on the other hand, suppressed the G-neuron response in a graded fashion, depending on the frequency of the movement. These experiments suggest that the switching-off is brought about by a combination of proprioceptive feedback and central efferences. The switching-off phenomenon could either protect the grasshopper's auditory pathway from undesired effects of overloading by its own intense song (e.g. self-induced habituation as described by Krasne and Wine 1977) and should therefore apply for most auditory neurons. Alternatively it could prevent escape reflexes from being triggered by stridulatory self-stimulation and consequently might apply only for neurons involved in such networks (as the G-neuron might be).
在自由活动的双斑草螽（Chorthippus biguttulus）中，用长期植入的钩状电极从颈部神经索记录复合电位。在记录中，一个大型听觉中间神经元（即G神经元，卡尔姆林，1975a，b）的尖峰清晰可辨，该神经元通过其生理特性和形态得以识别。在静止的草螽中，G神经元对听觉和振动刺激有反应，但在雄性鸣叫时，对这两种刺激的反应都会受到抑制。当雄性的翅膀被移除，使其后腿的鸣叫运动不产生声音时，G神经元反应的抑制仍然会发生。当通过强制自切后腿来减少来自后腿的本体感受反馈时，这种关闭仍不完全（根据相关胸部肌肉组织的肌电图推断鸣叫模式的产生）。另一方面，施加后腿的运动以分级的方式抑制G神经元的反应，这取决于运动的频率。这些实验表明，这种关闭是由本体感受反馈和中枢传出信号共同作用引起的。这种关闭现象要么是为了保护草螽的听觉通路免受其自身强烈鸣叫过载的不良影响（例如，如克拉斯内和瓦恩1977年所描述的自我诱导习惯化），因此应该适用于大多数听觉神经元。或者，它可以防止逃避反射因鸣叫自我刺激而被触发，因此可能仅适用于参与此类网络的神经元（如G神经元可能参与的网络）。
