Many of the amazing functional capabilities of the brain are collective properties stemming from the interactions of large sets of individual neurons. In particular, the most salient collective phenomena in brain activity are oscillations, which require the synchronous activation of many neurons. Here, we analyse parsimonious dynamical models of neural synchronization running on top of synthetic networks that capture essential aspects of the actual brain anatomical connectivity such as a hierarchicalmodular and core-periphery structure. These models reveal the emergence of complex collective states with intermediate and flexible levels of synchronization, halfway in the synchronous asynchronous spectrum. These states are best described as broad Griffithslike phases, i.e. an extension of standard critical points that emerge in structurally heterogeneous systems. We analyse different routes (bifurcations) to synchronization and stress the relevance of hybrid-Type transitions to generate rich dynamical patterns. Overall, our results illustrate the complex interplay between structure and dynamics, underlining key aspects leading to rich collective states needed to sustain brain functionality. This article is part of the theme issue Emergent phenomena in complex physical and socio-Technical systems: from cells to societies .2022 The Author(s) Published by the Royal Society. All rights reserved.

The broad edge of synchronization: Griffiths effects and collective phenomena in brain networks / Buendia, V.; Villegas, P.; Burioni, R.; Munoz, M. A.. - In: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A: MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES. - ISSN 1364-503X. - 380:2227(2022). [10.1098/rsta.2020.0424]

The broad edge of synchronization: Griffiths effects and collective phenomena in brain networks

Burioni R.;Munoz M. A.
2022-01-01

Abstract

Many of the amazing functional capabilities of the brain are collective properties stemming from the interactions of large sets of individual neurons. In particular, the most salient collective phenomena in brain activity are oscillations, which require the synchronous activation of many neurons. Here, we analyse parsimonious dynamical models of neural synchronization running on top of synthetic networks that capture essential aspects of the actual brain anatomical connectivity such as a hierarchicalmodular and core-periphery structure. These models reveal the emergence of complex collective states with intermediate and flexible levels of synchronization, halfway in the synchronous asynchronous spectrum. These states are best described as broad Griffithslike phases, i.e. an extension of standard critical points that emerge in structurally heterogeneous systems. We analyse different routes (bifurcations) to synchronization and stress the relevance of hybrid-Type transitions to generate rich dynamical patterns. Overall, our results illustrate the complex interplay between structure and dynamics, underlining key aspects leading to rich collective states needed to sustain brain functionality. This article is part of the theme issue Emergent phenomena in complex physical and socio-Technical systems: from cells to societies .2022 The Author(s) Published by the Royal Society. All rights reserved.
2022
The broad edge of synchronization: Griffiths effects and collective phenomena in brain networks / Buendia, V.; Villegas, P.; Burioni, R.; Munoz, M. A.. - In: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A: MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES. - ISSN 1364-503X. - 380:2227(2022). [10.1098/rsta.2020.0424]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2936031
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