Cognitive Neurodynamics

, Volume 6, Issue 1, pp 89–106

Dynamics of period-doubling bifurcation to chaos in the spontaneous neural firing patterns

Research Article

DOI: 10.1007/s11571-011-9184-7

Cite this article as:
Jia, B., Gu, H., Li, L. et al. Cogn Neurodyn (2012) 6: 89. doi:10.1007/s11571-011-9184-7


Period-doubling bifurcation to chaos were discovered in spontaneous firings of Onchidium pacemaker neurons. In this paper, we provide three cases of bifurcation processes related to period-doubling bifurcation cascades to chaos observed in the spontaneous firing patterns recorded from an injured site of rat sciatic nerve as a pacemaker. Period-doubling bifurcation cascades to period-4 (π(2,2)) firstly, and then to chaos, at last to a periodicity, which can be period-5, period-4 (π(4)) and period-3, respectively, in different pacemakers. The three bifurcation processes are labeled as case I, II and III, respectively, manifesting procedures different to those of period-adding bifurcation. Higher-dimensional unstable periodic orbits (UPOs) can be detected in the chaos, built close relationships to the periodic firing patterns. Case III bifurcation process is similar to that discovered in the Onchidium pacemaker neurons and simulated in theoretical model-Chay model. The extra-large Feigenbaum constant manifesting in the period-doubling bifurcation process, induced by quasi-discontinuous characteristics exhibited in the first return maps of both ISI series and slow variable of Chay model, shows that higher-dimensional periodic behaviors appeared difficult within the period-doubling bifurcation cascades. The results not only provide examples of period-doubling bifurcation to chaos and chaos with higher-dimensional UPOs, but also reveal the dynamical features of the period-doubling bifurcation cascades to chaos.


Neural firing patternPeriod-doubling bifurcationChaosUnstable periodic orbitsFeigenbaum constantNon-smooth characteristicQuasi-discontinuous characteristicPeriod-adding bifurcation

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.School of Aerospace Engineering and Applied MechanicsTongji UniversityShanghaiChina
  2. 2.College of Life ScienceShaanxi Normal UniversityXi’anChina
  3. 3.Science and Training Center of Chinese AstronauticsBeijingChina