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Open AccessArticle

Connective Core Structures in Cognitive Networks: the Role of Hubs

Hospital Israelita Albert Einstein, Av. Albert Einstein 627, Morumbi, São Paulo, SP, Brazil
Swarthmore College, 500 College Avenue, Swarthmore, PA, USA
The Yale Stress Center, Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
Université Pierre et Marie Curie (Sorbonne Paris 6), 4 Place Jussieu, 75005 Paris, France
Author to whom correspondence should be addressed.
Entropy 2019, 21(10), 961;
Received: 1 January 1970 / Revised: 20 August 2019 / Accepted: 27 August 2019 / Published: 30 September 2019
Complex network analysis applied to the resting brain has shown that sets of highly interconnected networks with coherent activity may support a default mode of brain function within a global workspace. Perceptual processing of environmental stimuli induces architectural changes in network topology with higher specialized modules. Evidence shows that during cognitive tasks, network topology is reconfigured and information is broadcast from modular processors to a connective core, promoting efficient information integration. In this paper, we explored how the brain adapts its effective connectivity within the connective core and across behavioral states. We used complex network metrics to identify hubs and proposed a method of classification based on the effective connectivity patterns of information flow. Finally, we interpreted the role of the connective core and each type of hub on the network effectiveness. We also calculated the complexity of electroencephalography microstate sequences across different tasks. We observed that divergent hubs contribute significantly to the network effectiveness and that part of this contribution persists across behavioral states, forming an invariant structure. Moreover, we found that a large quantity of multiple types of hubs may be associated with transitions of functional networks.
Keywords: brain connectivity; complex networks; connective core brain connectivity; complex networks; connective core
MDPI and ACS Style

Arruda Baltazar, C.; Barros Guinle, M.I.; Caron, C.J.; Amaro, E., Jr.; Soares Machado, B. Connective Core Structures in Cognitive Networks: the Role of Hubs. Entropy 2019, 21, 961.

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