Temperature dependence of temporal resolution in an insect nervous system
Temperature dependence of temporal resolution in an insect nervous system
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DOI：
10.1007/s00359-002-0298-6
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发表时间：
2002-05-01
影响因子：
2.1
通讯作者：
Ronacher, B
中科院分区：
文献类型：
--
作者：
Franz, A;Ronacher, B
绝大多数动物都是变温动物，因此面临的问题是，它们的神经系统的温度相当平稳地跟随环境所施加的温度变化。由于神经细胞的基本特性，例如，离子通道的时间常数强烈地依赖于温度，温度变化可能影响感觉刺激的时间结构的处理。这在其中信号的时间模式对于接收器的识别是决定性的声学通信系统中可能是关键的。我们通过改变实验动物在细胞内记录过程中的温度，研究了蝗虫听觉感受器和中间神经元反应的温度依赖性。在间隙检测范例中确定了声信号快速幅度调制的分辨率。在听觉感受器和局部（二阶）中间神经元，时间分辨率提高在较高的温度。这种增益可以归因于更高的尖峰定时精度。在三阶神经元中，温度的升高以复杂的方式影响抑制和兴奋的相互作用，也导致毫秒范围内的间隙的更好的分辨率。
The vast majority of animals are poikilo-therms, and thus face the problem that the temperature of their nervous systems rather smoothly follows the temperature changes imposed by their environment. Since basic properties of nerve cells, e.g., the time constants of ion channels, strongly depend on temperature, a temperature shift likely affects the processing of the temporal structure of sensory stimuli. This can be critical in acoustic communication systems in which time patterns of signals are decisive for recognition by the receiver. We investigated the temperature dependence of the responses of locust auditory receptors and interneurons by varying the temperature of the experimental animals during intracellular recordings. The resolution of fast amplitude modulations of acoustic signals was determined in a gap detection paradigm. In auditory receptors and local (second order) interneurons, temporal resolution was improved at higher temperatures. This gain could be attributed to a higher precision of spike timing. In a third-order neuron, a rise in temperature affected the interactions of inhibition and excitation in a complex manner, also resulting in a better resolution of gaps in the millisecond range.