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Chin. Phys. B, 2023, Vol. 32(1): 010504    DOI: 10.1088/1674-1056/ac9363
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Influence of coupling asymmetry on signal amplification in a three-node motif

Xiaoming Liang(梁晓明)1,†, Chao Fang(方超)1, Xiyun Zhang(张希昀)2, and Huaping Lü(吕华平)1
1 School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;
2 Department of Physics, Jinan University, Guangzhou 510632, China
Abstract  The three-node feedforward motif has been revealed to function as a weak signal amplifier. In this motif, two nodes (input nodes) receive a weak input signal and send it unidirectionally to the third node (output node). Here, we change the motif's unidirectional couplings (feedforward) to bidirectional couplings (feedforward and feedback working together). We find that a small asymmetric coupling, in which the feedforward effect is stronger than the feedback effect, may enable the three-node motif to go through two distinct dynamic transitions, giving rise to a double resonant signal response. We present an analytical description of the double resonance, which agrees with the numerical findings.
Keywords:  network motif      synchronization      coupling asymmetry      signal amplification  
Received:  05 July 2022      Revised:  02 September 2022      Accepted manuscript online:  21 September 2022
PACS:  05.45.Xt (Synchronization; coupled oscillators)  
  87.19.ln (Oscillations and resonance)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12175087 and 12105117).
Corresponding Authors:  Xiaoming Liang     E-mail:

Cite this article: 

Xiaoming Liang(梁晓明), Chao Fang(方超), Xiyun Zhang(张希昀), and Huaping Lü(吕华平) Influence of coupling asymmetry on signal amplification in a three-node motif 2023 Chin. Phys. B 32 010504

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