Brain Network Modularity During a Sustained Working-Memory Task

Spontaneous oscillations of the blood oxygenation level-dependent (BOLD) signal are spatially synchronized within specific brain networks and are thought to reflect synchronized brain activity. Networks are modulated by the performance of a task, even if the exact features and degree of such modulat...

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Published inFrontiers in physiology Vol. 11; p. 422
Main Authors Moraschi, Marta, Mascali, Daniele, Tommasin, Silvia, Gili, Tommaso, Hassan, Ibrahim Eid, Fratini, Michela, DiNuzzo, Mauro, Wise, Richard G, Mangia, Silvia, Macaluso, Emiliano, Giove, Federico
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LanguageEnglish
Published Switzerland Frontiers 08.05.2020
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Abstract Spontaneous oscillations of the blood oxygenation level-dependent (BOLD) signal are spatially synchronized within specific brain networks and are thought to reflect synchronized brain activity. Networks are modulated by the performance of a task, even if the exact features and degree of such modulations are still elusive. The presence of networks showing anticorrelated fluctuations lend initially to suppose that a competitive relationship between the default mode network (DMN) and task positive networks (TPNs) supports the efficiency of brain processing. However, more recent results indicate that cooperative and competitive dynamics between networks coexist during task performance. In this study, we used graph analysis to assess the functional relevance of the topological reorganization of brain networks ensuing the execution of a steady state working-memory (WM) task. Our results indicate that the performance of an auditory WM task is associated with a switching between different topological configurations of several regions of specific networks, including frontoparietal, ventral attention, and dorsal attention areas, suggesting segregation of ventral attention regions in the presence of increased overall integration. However, the correct execution of the task requires integration between components belonging to all the involved networks.
AbstractList Spontaneous oscillations of the blood oxygenation level-dependent (BOLD) signal are spatially synchronized within specific brain networks and are thought to reflect synchronized brain activity. Networks are modulated by the performance of a task, even if the exact features and degree of such modulations are still elusive. The presence of networks showing anticorrelated fluctuations lend initially to suppose that a competitive relationship between the default mode network (DMN) and task positive networks (TPNs) supports the efficiency of brain processing. However, more recent results indicate that cooperative and competitive dynamics between networks coexist during task performance. In this study, we used graph analysis to assess the functional relevance of the topological reorganization of brain networks ensuing the execution of a steady state working-memory (WM) task. Our results indicate that the performance of an auditory WM task is associated with a switching between different topological configurations of several regions of specific networks, including frontoparietal, ventral attention, and dorsal attention areas, suggesting segregation of ventral attention regions in the presence of increased overall integration. However, the correct execution of the task requires integration between components belonging to all the involved networks.
Author Moraschi, Marta
Gili, Tommaso
DiNuzzo, Mauro
Macaluso, Emiliano
Mascali, Daniele
Mangia, Silvia
Fratini, Michela
Tommasin, Silvia
Wise, Richard G
Giove, Federico
Hassan, Ibrahim Eid
AuthorAffiliation 4 Dipartimento di Fisica, Sapienza Università di Roma , Rome , Italy
1 Centro Fermi–Museo Storico della Fisica e Centro di Studi e Ricerche Enrico Fermi , Rome , Italy
3 Dipartimento di Neuroscienze Umane, Sapienza Univeristà di Roma , Rome , Italy
8 Institute for Advanced Biomedical Technologies, University of Chieti , Chieti , Italy
9 Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University , Cardiff , United Kingdom
6 Istituto di Nanotecnologia, Consiglio Nazionale delle Ricerche , Rome , Italy
11 ImpAct Team, Lyon Neuroscience Research Center, Université de Lyon , Lyon , France
2 Fondazione Santa Lucia IRCCS , Rome , Italy
7 Independent Researcher , Rome , Italy
10 Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota , Minneapolis, MN , United States
5 Department of Physics, Helwan University , Cairo , Egypt
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Keywords connectivity dynamics
functional connectivity
modularity
working memory
topology
brain segregation
Language English
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PMCID: PMC7227445
Reviewed by: Andreas Hess, University of Erlangen-Nuremberg, Germany; Xiaoyun Liang, Australian Catholic University, Australia
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Snippet Spontaneous oscillations of the blood oxygenation level-dependent (BOLD) signal are spatially synchronized within specific brain networks and are thought to...
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SubjectTerms brain segregation
connectivity dynamics
functional connectivity
Life Sciences
modularity
Physiology
topology
working memory
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Title Brain Network Modularity During a Sustained Working-Memory Task
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