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Wild oscillations in a nonlinear neuron model with resets: (II) Mixed-mode oscillations

Abstrakt

This work continues the analysis of complex dynamics in a class of bidimensional nonlinear hybrid dynamical systems with resets modeling neuronal voltage dynamics with adaptation and spike emission. We show that these models can generically display a form of mixed-mode oscillations (MMOs), which are trajectories featuring an alternation of small oscillations with spikes or bursts (multiple consecutive spikes). The mechanism by which these are generated relies fundamentally on the hybrid structure of the flow: invariant manifolds of the continuous dynamics govern small oscillations, while discrete resets govern the emission of spikes or bursts, contrasting with classical MMO mechanisms in ordinary differential equations involving more than three dimensions and generally relying on a timescale separation. The decomposition of mechanisms reveals the geometrical origin of MMOs, allowing a relatively simple classification of points on the reset manifold associated to specific numbers of small oscillations. We show that the MMO pattern can be described through the study of orbits of a discrete adaptation map, which is singular as it features discrete discontinuities with unbounded left- and right-derivatives. We study orbits of the map via rotation theory for discontinuous circle maps and elucidate in detail complex behaviors arising in the case where MMOs display at most one small oscillation between each consecutive pair of spikes.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B nr 22, wydanie 10, strony 4003 - 4039,
ISSN: 1531-3492
Język:
angielski
Rok wydania:
2017
Opis bibliograficzny:
Rubin J., Signerska-Rynkowska J., Touboul J., Vidal A.: Wild oscillations in a nonlinear neuron model with resets: (II) Mixed-mode oscillations// DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B. -Vol. 22, iss. 10 (2017), s.4003-4039
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.3934/dcdsb.2017205
Weryfikacja:
Politechnika Gdańska

wyświetlono 11 razy

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