摘要
研究了阈下信号在含噪声的Hodgkin-Huxley神经元单向耦合系统中的传输特性.结果表明,各单元中均存在随机共振现象,可见噪声有助于提高信号的检测和传输;另外,耦合实现了信号的传输,且随着耦合强度的增强信号的传输效率增加,在耦合强度达到某一程度时两神经元实现了有时延的一致放电;并且接收元的信噪比最优值处的噪声强度随着耦合强度的提高而减小,最终与驱动元的一致;另外在耦合强度过强时,接收元出现过耦合放电,但是最终会被不断增强的噪声抑制,此现象有助于解释神经元的自放电及神经系统的自调节.研究表明噪声和耦合在神经系统传输弱信号过程中起重要作用,且有助于揭开神经系统的信号传输机理,在模型中解释生物学现象.
The study of signal transmission in neural models is helpful to investigate and model the transmission mechanism of biological neural systems, and realize the signal processing of cognition mechanism. We investigate the transmission of weak signals in a noisy one-way coupled Hodgkin-Huxley neural system. The results show that there is stochastic resonance and it helps to detect and transmit the signal. In addition, the coupling enables the signal transmission in the system. The efficiency of the signal transmission is increased with the increasing coupling strength. At some strength the firing of the elements will be in synchronization. What＇ s more, the optimal noise intensity of the receptor declines with the increase of the coupling strength, in the end will be equal to that of the driver. When the coupling strength is too high, the receptor will fire by itself. But the spikes will be suppressed by the increasing noise. It may be used to interpret the self action of neurons and the self adjusting in neural system. In addition, these results show that the noise and coupling are important to the transmission of weak signal in neural system. This study maybe helpful to interpret some phenomena in biological experiments.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期5065-5069,共5页
Acta Physica Sinica
