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Chin. Phys. B, 2023, Vol. 32(9): 098701    DOI: 10.1088/1674-1056/acd7ce
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Free running period affected by network structures of suprachiasmatic nucleus neurons exposed to constant light

Jian Zhou(周建), Changgui Gu(顾长贵), Yuxuan Song(宋雨轩), and Yan Xu(许艳)
Business School, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract  Exposed to the natural light-dark cycle, 24 h rhythms exist in behavioral and physiological processes of living beings. Interestingly, under constant darkness or constant light, living beings can maintain a robust endogenous rhythm with a free running period (FRP) close to 24 h. In mammals, the circadian rhythm is coordinated by a master clock located in the suprachiasmatic nucleus (SCN) of the brain, which is composed of about twenty thousand self-oscillating neurons. These SCN neurons form a heterogenous network to output a robust rhythm. Thus far, the exact network topology of the SCN neurons is unknown. In this article, we examine the effect of the SCN network structure on the FRP when exposed to constant light by a Poincaré model. Four typical network structures are considered, including a nearest-neighbor coupled network, a Newman-Watts small world network, an Erdös-Rényi random network and a Barabási-Albert (BA) scale free network. The results show that the FRP is longest in the BA network, because the BA network is characterized by the most heterogeneous structure among these four types of networks. These findings are not affected by the average node degree of the SCN network or the value of relaxation rate of the SCN neuronal oscillators. Our findings contribute to the understanding of how the network structure of the SCN neurons influences the FRP.
Keywords:  circadian rhythm      light sensitivity      heterogeneous network      free running period  
Received:  26 February 2023      Revised:  16 April 2023      Accepted manuscript online:  23 May 2023
PACS:  87.18.Yt (Circadian rhythms)  
  05.45.Xt (Synchronization; coupled oscillators)  
  87.18.Sn (Neural networks and synaptic communication)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12275179 and 11875042) and the Natural Science Foundation of Shanghai (Grant No. 21ZR1443900).
Corresponding Authors:  Changgui Gu     E-mail:  gu_changgui@163.com

Cite this article: 

Jian Zhou(周建), Changgui Gu(顾长贵), Yuxuan Song(宋雨轩), and Yan Xu(许艳) Free running period affected by network structures of suprachiasmatic nucleus neurons exposed to constant light 2023 Chin. Phys. B 32 098701

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