Extreme phase sensitivity in systems with fractal isochrons

PHYSICA D-NONLINEAR PHENOMENA

卷:308

Article

Mauroya, A.¹  Mezic, I.² 

[1] Univ Liege, Dept Elect Engn & Comp Sci, B-4000 Liege, Belgium

[2] Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA

关键词: Isochrons;    Fractals;    Transient chaos;    Bursting neurons;   

DOI  :  10.1016/j.physd.2015.06.004

来源: Elsevier

【 摘 要 】

Sensitivity to initial conditions is usually associated with chaotic dynamics and strange attractors. However, even systems with (quasi)periodic dynamics can exhibit it. In this context we report on the fractal properties of the isochrons of some continuous-time asymptotically periodic systems. We define a global measure of phase sensitivity that we call the phase sensitivity coefficient and show that it is an invariant of the system related to the capacity dimension of the isochrons. Similar results are also obtained with discrete-time systems. As an illustration of the framework, we compute the phase sensitivity coefficient for popular models of bursting neurons, suggesting that some elliptic bursting neurons are characterized by isochrons of high fractal dimensions and exhibit a very sensitive (unreliable) phase response. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free