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Criticality or supersymmetry breaking?

In many stochastic dynamical systems, ordinary chaotic behavior is preceded by a full-dimensional phase that exhibits 1/f-type power spectra and/or scale-free statistics of (anti)instantons such as neuroavalanches, earthquakes, etc. In contrast with the phenomenological concept of self-organized cri...

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Main Authors: Ovchinnikov, Igor V. (Author) , Li, Wenyuan (Author) , Sun, Yuquan (Author) , Hudson, Andrew E. (Author) , Meier, Karlheinz (Author) , Schwartz, Robert N. (Author) , Wang, Kang L. (Author)
Format: Article (Journal)
Language:English
Published: 12 May 2020
In: Symmetry
Year: 2020, Volume: 12, Issue: 5
ISSN:2073-8994
DOI:10.3390/sym12050805
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/sym12050805
Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2073-8994/12/5/805
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Author Notes:Igor V. Ovchinnikov, Wenyuan Li, Yuquan Sun, Andrew E. Hudson, Karlheinz Meier, Robert N. Schwartz and Kang L. Wang

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520 |a In many stochastic dynamical systems, ordinary chaotic behavior is preceded by a full-dimensional phase that exhibits 1/f-type power spectra and/or scale-free statistics of (anti)instantons such as neuroavalanches, earthquakes, etc. In contrast with the phenomenological concept of self-organized criticality, the recently found approximation-free supersymmetric theory of stochastics (STS) identifies this phase as the noise-induced chaos (N-phase), i.e., the phase where the topological supersymmetry pertaining to all stochastic dynamical systems is broken spontaneously by the condensation of the noise-induced (anti)instantons. Here, we support this picture in the context of neurodynamics. We study a 1D chain of neuron-like elements and find that the dynamics in the N-phase is indeed featured by positive stochastic Lyapunov exponents and dominated by (anti)instantonic processes of (creation) annihilation of kinks and antikinks, which can be viewed as predecessors of boundaries of neuroavalanches. We also construct the phase diagram of emulated stochastic neurodynamics on Spikey neuromorphic hardware and demonstrate that the width of the N-phase vanishes in the deterministic limit in accordance with STS. As a first result of the application of STS to neurodynamics comes the conclusion that a conscious brain can reside only in the N-phase. 
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