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Networks of cortical activity in infants with epilepsy
Epilepsy in infancy links to a significant risk of neurodevelopmental delay, calling for a better understanding of its underlying mechanisms. Here, we studied cortical activity networks in infants with early-onset epilepsy to identify network properties that could pre-empt infants’ neurodevelopmenta...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9692198/ https://www.ncbi.nlm.nih.gov/pubmed/36447560 http://dx.doi.org/10.1093/braincomms/fcac295 |
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author | Auno, Sami Jonsson, Henna Linnankivi, Tarja Tokariev, Anton Vanhatalo, Sampsa |
author_facet | Auno, Sami Jonsson, Henna Linnankivi, Tarja Tokariev, Anton Vanhatalo, Sampsa |
author_sort | Auno, Sami |
collection | PubMed |
description | Epilepsy in infancy links to a significant risk of neurodevelopmental delay, calling for a better understanding of its underlying mechanisms. Here, we studied cortical activity networks in infants with early-onset epilepsy to identify network properties that could pre-empt infants’ neurodevelopmental course. We studied high-density (64 channel) electroencephalogram during non-rapid eye movement (N2) sleep in n = 49 infants at 1 year of age after being diagnosed with epilepsy during their first year of life. We computed frequency-specific networks in the cortical source space for two intrinsic brain modes: amplitude–amplitude and phase–phase correlations. Cortical activity networks of all frequency bands and connectivity modes were compared between the syndrome groups as well as between the three categories of neurocognitive development. The group differences were studied at three spatial levels: global, regional, and individual connections. Cortical mechanisms related to infant epilepsy were further compared with physiological networks using an automatic spindle detection algorithm. Our results show that global connectivity does not significantly differ between epilepsy syndromes; however, it co-varies with neurocognitive development. The largest network differences were observed at the lowest (<1 Hz) and mid-range (10–15 Hz) frequency bands. An algorithmic removal of sleep spindles from the data partially reduced the mid-range frequency network’s strength. The centrocentral and frontocentral networks at the spindle frequencies were found to be strongest in infants with a persistent age-typical neurocognitive performance, while their low-frequency (< 1 Hz) networks were weaker for both amplitude-amplitude [P = 0.008, effect size = 0.61] and phase–phase correlations (P = 0.02, effect size = 0.54) at low (< 1 Hz). However, subjects with persistent mild neurocognitive delay from 1 to 2 years of age had higher amplitude–amplitude (P = 0.02, effect size = 0.73) and phase–phase (P = 0.06, effect size = 0.59) at low frequencies than those that deteriorated from mild to severely delayed from 1 to 2 years of age. Our findings suggest that cortical activity networks reflect the underlying clinical course of infants’ epilepsy, and measures of spectrally and spatially resolved networks might become useful in better understanding infantile epilepsy as a network disease. |
format | Online Article Text |
id | pubmed-9692198 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-96921982022-11-28 Networks of cortical activity in infants with epilepsy Auno, Sami Jonsson, Henna Linnankivi, Tarja Tokariev, Anton Vanhatalo, Sampsa Brain Commun Original Article Epilepsy in infancy links to a significant risk of neurodevelopmental delay, calling for a better understanding of its underlying mechanisms. Here, we studied cortical activity networks in infants with early-onset epilepsy to identify network properties that could pre-empt infants’ neurodevelopmental course. We studied high-density (64 channel) electroencephalogram during non-rapid eye movement (N2) sleep in n = 49 infants at 1 year of age after being diagnosed with epilepsy during their first year of life. We computed frequency-specific networks in the cortical source space for two intrinsic brain modes: amplitude–amplitude and phase–phase correlations. Cortical activity networks of all frequency bands and connectivity modes were compared between the syndrome groups as well as between the three categories of neurocognitive development. The group differences were studied at three spatial levels: global, regional, and individual connections. Cortical mechanisms related to infant epilepsy were further compared with physiological networks using an automatic spindle detection algorithm. Our results show that global connectivity does not significantly differ between epilepsy syndromes; however, it co-varies with neurocognitive development. The largest network differences were observed at the lowest (<1 Hz) and mid-range (10–15 Hz) frequency bands. An algorithmic removal of sleep spindles from the data partially reduced the mid-range frequency network’s strength. The centrocentral and frontocentral networks at the spindle frequencies were found to be strongest in infants with a persistent age-typical neurocognitive performance, while their low-frequency (< 1 Hz) networks were weaker for both amplitude-amplitude [P = 0.008, effect size = 0.61] and phase–phase correlations (P = 0.02, effect size = 0.54) at low (< 1 Hz). However, subjects with persistent mild neurocognitive delay from 1 to 2 years of age had higher amplitude–amplitude (P = 0.02, effect size = 0.73) and phase–phase (P = 0.06, effect size = 0.59) at low frequencies than those that deteriorated from mild to severely delayed from 1 to 2 years of age. Our findings suggest that cortical activity networks reflect the underlying clinical course of infants’ epilepsy, and measures of spectrally and spatially resolved networks might become useful in better understanding infantile epilepsy as a network disease. Oxford University Press 2022-11-05 /pmc/articles/PMC9692198/ /pubmed/36447560 http://dx.doi.org/10.1093/braincomms/fcac295 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of the Guarantors of Brain. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Auno, Sami Jonsson, Henna Linnankivi, Tarja Tokariev, Anton Vanhatalo, Sampsa Networks of cortical activity in infants with epilepsy |
title | Networks of cortical activity in infants with epilepsy |
title_full | Networks of cortical activity in infants with epilepsy |
title_fullStr | Networks of cortical activity in infants with epilepsy |
title_full_unstemmed | Networks of cortical activity in infants with epilepsy |
title_short | Networks of cortical activity in infants with epilepsy |
title_sort | networks of cortical activity in infants with epilepsy |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9692198/ https://www.ncbi.nlm.nih.gov/pubmed/36447560 http://dx.doi.org/10.1093/braincomms/fcac295 |
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