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arXiv 0708.0703q-bio.NCq-bio.SC
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通道噪声下神经元阈下脉冲的检测

Detection of subthreshold pulses in neurons with channel noise

Yong Chen, Lianchun Yu, Shao-Meng Qin

摘要:

神经元会受到各种噪音的影响。除了突触噪声之外,离子通道的随机打开和关闭表示影响神经元的信号处理特性的固有噪声源。本文研究了随机Hodgkin-Huxley神经元对瞬态输入阈下脉冲的响应。结果表明,随着信道噪声幅值的增大,平均响应时间减小,方差增大。在单脉冲检测的情况下,我们表明,通道噪声使一个神经元检测阈下信号和最佳膜面积(或通道噪声强度)存在一个单一的神经元,以达到最佳性能。然而,单个神经元的检测能力受到较大误差的限制。在这里,我们测试了一个简单的神经网络,可以提高神经元的脉冲检测能力,发现几十个神经元可以完美地检测阈下脉冲。在单神经元和网络两个层次上都存在着内在随机共振现象。在网络级,可以针对包括网络的神经元的数量来优化网络的检测能力。

英文摘要:

Neurons are subject to various kinds of noise. In addition to synaptic noise, the stochastic opening and closing of ion channels represents an intrinsic source of noise that affects the signal processing properties of the neuron. In this paper, we studied the response of a stochastic Hodgkin-Huxley neuron to transient input subthreshold pulses. It was found that the average response time decreases but variance increases as the amplitude of channel noise increases. In the case of single pulse detection, we show that channel noise enables one neuron to detect the subthreshold signals and an optimal membrane area (or channel noise intensity) exists for a single neuron to achieve optimal performance. However, the detection ability of a single neuron is limited by large errors. Here, we test a simple neuronal network that can enhance the pulse detecting abilities of neurons and find dozens of neurons can perfectly detect subthreshold pulses. The phenomenon of intrinsic stochastic resonance is also found both at the level of single neurons and at the level of networks. At the network level, the detection ability of networks can be optimized for the number of neurons comprising the network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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