Bifurcation Analysis in a Two-neuron System with Different Time Delays

In this paper, we consider a two-neuron system with time-delayed connections between neurons. By analyzing the associated characteristic transcendental equation, its linear stability is investigated and Hopf bifurcation is demonstrated. Some explicit formulae for determining the stability and the direction of the Hopf bifurcation periodic solutions bifurcating from Hopf bifurcations are obtained by using the normal form theory and center manifold theory. Some numerical simulation results are given to support the theoretical predictions. Finally, main conclusions are given.


Authors:



References:
[1] K. L. Babcock and R. M. Westervelt, Dynamics of simple electric neural
networks. Physica D 28 (1987) 305-316.
[2] K. L. Babcock and R. M. Westervelt, Dynamics of simple electric neural
networks with added intertial. Physica D 23 (1986) 464-469.
[3] K. Gopalsamy and I. Leung, Delay-induced periodicity in a neural
network of excitation and inhibition. Physica D 89 (1996) 395-426.
[4] K. Gopalsamy and I. Leung, Converge under dynamical thresholds with
delays. IEEE Trans. Neural Netw. 8 (1997) 341-348.
[5] K. Gopalsamy, I. Leung and P. Liu, Global Hopf bifurcation in a neural
netlet. Appl. Math. Comput. 94 (1998) 171-192.
[6] J. Hale, Theory of Functional Differential Equation. Springer-Verlag,
1977.
[7] B. Hassard, D. Kazarino and Y. Wan, Theory and applications of Hopf
bifurcation. Cambridge: Cambridge University Press, 1981.
[8] X. F. Liao, S.W. Li and G. R. Chen, Bifurcation analysis on a two-neuron
system with distributed dedays in the domain. Neural Netw. 17 (2004)
545-561.
[9] X. F. Liao, K. W. Wong and Z. F. Wu, Bifurcation analysis on a twoneuron
system with distributed dedays. Physica D 149 (2001) 123-141.
[10] X. F. Liao, K. W. Wong, C. S. Leung and Z. F. Wu, Hopf bifurcation and
chaos in a single delayed neuron equation with nonmonotonic activation
function. Chaos, Solitons and Fractals 12 (2001) 1535-1547.
[11] X. F. Liao, Z. F. Wu and J. B. Yu, Hopf bifurcation analysis of a
neural systems with a continuously distributed delay. Proceeding of the
International Symposium on Signal Processing and Intelligent System.
Guangzhou, China, (1999) 102-106.
[12] X. F. Liao, Z. F. Wu and J. B. Yu, Stability switches and bifurcation
analysis of a neural network with continuous delay. IEEE Trans. syst.
man cyber. A 29 (1999) 692-696.
[13] C. M. Marcus and R. M. Westervelt, Stability of analog networks with
delay. Phys. Rev. A 39 (1989) 347-359.
[14] L. Olien and J. Belair, Bifurcation, stability and monotonicity properties
of a delayed neural model. Physica D 102 (1997) 349-363.
[15] S. Ruan and J. Wei, On the zero of some transcendential functions with
applications to stability of delay differential equations with two delays.
Dyn. Contin. Discrete Impuls. Syst. Ser. A 10 (2003) 863-874.
[16] F. H. Tu, X. F. Liao and W. Zhang, Delay-dependent asymptotic stability
of a two-neuron system with different time delays. Chaos, Solitons and
Frctals 28 (2006) 437-447.