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Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits

Synchronization of neural activity across brain regions is critical to processes that include perception, learning, and memory. After traumatic brain injury (TBI), neuronal degeneration is one possible effect and can alter communication between neural circuits. Consequently, synchronization between...

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Detalles Bibliográficos
Autores principales: Schumm, Samantha N., Gabrieli, David, Meaney, David F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7063469/
https://www.ncbi.nlm.nih.gov/pubmed/32194390
http://dx.doi.org/10.3389/fncom.2020.00018
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author Schumm, Samantha N.
Gabrieli, David
Meaney, David F.
author_facet Schumm, Samantha N.
Gabrieli, David
Meaney, David F.
author_sort Schumm, Samantha N.
collection PubMed
description Synchronization of neural activity across brain regions is critical to processes that include perception, learning, and memory. After traumatic brain injury (TBI), neuronal degeneration is one possible effect and can alter communication between neural circuits. Consequently, synchronization between neurons may change and can contribute to both lasting changes in functional brain networks and cognitive impairment in patients. However, fundamental principles relating exactly how TBI at the cellular scale affects synchronization of mesoscale circuits are not well understood. In this work, we use computational networks of Izhikevich integrate-and-fire neurons to study synchronized, oscillatory activity between clusters of neurons, which also adapt according to spike-timing-dependent plasticity (STDP). We study how the connections within and between these neuronal clusters change as unidirectional connections form between the two neuronal populations. In turn, we examine how neuronal deletion, intended to mimic the temporary or permanent loss of neurons in the mesoscale circuit, affects these dynamics. We determine synchronization of two neuronal circuits requires very modest connectivity between these populations; approximately 10% of neurons projecting from one circuit to another circuit will result in high synchronization. In addition, we find that synchronization level inversely affects the strength of connection between neuronal microcircuits – moderately synchronized microcircuits develop stronger intercluster connections than do highly synchronized circuits. Finally, we find that highly synchronized circuits are largely protected against the effects of neuronal deletion but may display changes in frequency properties across circuits with targeted neuronal loss. Together, our results suggest that strongly and weakly connected regions differ in their inherent resilience to damage and may serve different roles in a larger network.
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spelling pubmed-70634692020-03-19 Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits Schumm, Samantha N. Gabrieli, David Meaney, David F. Front Comput Neurosci Neuroscience Synchronization of neural activity across brain regions is critical to processes that include perception, learning, and memory. After traumatic brain injury (TBI), neuronal degeneration is one possible effect and can alter communication between neural circuits. Consequently, synchronization between neurons may change and can contribute to both lasting changes in functional brain networks and cognitive impairment in patients. However, fundamental principles relating exactly how TBI at the cellular scale affects synchronization of mesoscale circuits are not well understood. In this work, we use computational networks of Izhikevich integrate-and-fire neurons to study synchronized, oscillatory activity between clusters of neurons, which also adapt according to spike-timing-dependent plasticity (STDP). We study how the connections within and between these neuronal clusters change as unidirectional connections form between the two neuronal populations. In turn, we examine how neuronal deletion, intended to mimic the temporary or permanent loss of neurons in the mesoscale circuit, affects these dynamics. We determine synchronization of two neuronal circuits requires very modest connectivity between these populations; approximately 10% of neurons projecting from one circuit to another circuit will result in high synchronization. In addition, we find that synchronization level inversely affects the strength of connection between neuronal microcircuits – moderately synchronized microcircuits develop stronger intercluster connections than do highly synchronized circuits. Finally, we find that highly synchronized circuits are largely protected against the effects of neuronal deletion but may display changes in frequency properties across circuits with targeted neuronal loss. Together, our results suggest that strongly and weakly connected regions differ in their inherent resilience to damage and may serve different roles in a larger network. Frontiers Media S.A. 2020-03-03 /pmc/articles/PMC7063469/ /pubmed/32194390 http://dx.doi.org/10.3389/fncom.2020.00018 Text en Copyright © 2020 Schumm, Gabrieli and Meaney. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Schumm, Samantha N.
Gabrieli, David
Meaney, David F.
Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title_full Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title_fullStr Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title_full_unstemmed Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title_short Neuronal Degeneration Impairs Rhythms Between Connected Microcircuits
title_sort neuronal degeneration impairs rhythms between connected microcircuits
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7063469/
https://www.ncbi.nlm.nih.gov/pubmed/32194390
http://dx.doi.org/10.3389/fncom.2020.00018
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