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.
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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