Firing-rate resonances in the peripheral auditory system of the cricket, Gryllus bimaculatus
Firing-rate resonances in the peripheral auditory system of the cricket, Gryllus bimaculatus
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DOI：
10.1007/s00359-015-1036-1
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发表时间：
2015-11-01
影响因子：
2.1
通讯作者：
Schreiber, Susanne
中科院分区：
文献类型：
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作者：
Rau, Florian;Clemens, Jan;Schreiber, Susanne
在许多通信系统中，信息以信号的时间模式编码。对于在特定频带中携带信息的节奏信号，神经元系统可以通过调整其固有的滤波特性来获得相应频率范围内的峰值灵敏度。蟋蟀Gryllus bimaculatus评估同种和捕食者的声音通信信号。同种异体的鸣声信号表现出一种特征脉冲模式，它只包含一个狭窄的调制频率范围。我们检查了蟋蟀外周听觉系统中的单个神经元（AN1, AN2, ON1），通过评估它们的放电率共振来调节特定的调制频率。具有扫描频率包络的声刺激可以有效地表征细胞的调制传递函数。一些被检测的细胞表现出调谐的带通特性。使用简单的计算模型，我们展示了不同的、细胞固有的或基于网络的机制，如亚阈值共振、尖峰触发的适应，以及激发和抑制的相互作用，如何解释实验观察到的发射率共振。因此，共享负反馈作为共同主题的基本神经元机制可能有助于蟋蟀周围听觉通路的选择性，这种选择性旨在识别配偶和避免捕食者。
In many communication systems, information is encoded in the temporal pattern of signals. For rhythmic signals that carry information in specific frequency bands, a neuronal system may profit from tuning its inherent filtering properties towards a peak sensitivity in the respective frequency range. The cricket Gryllus bimaculatus evaluates acoustic communication signals of both conspecifics and predators. The song signals of conspecifics exhibit a characteristic pulse pattern that contains only a narrow range of modulation frequencies. We examined individual neurons (AN1, AN2, ON1) in the peripheral auditory system of the cricket for tuning towards specific modulation frequencies by assessing their firing-rate resonance. Acoustic stimuli with a swept-frequency envelope allowed an efficient characterization of the cells' modulation transfer functions. Some of the examined cells exhibited tuned band-pass properties. Using simple computational models, we demonstrate how different, cell-intrinsic or network-based mechanisms such as subthreshold resonances, spike-triggered adaptation, as well as an interplay of excitation and inhibition can account for the experimentally observed firing-rate resonances. Therefore, basic neuronal mechanisms that share negative feedback as a common theme may contribute to selectivity in the peripheral auditory pathway of crickets that is designed towards mate recognition and predator avoidance.