The organization of functional neurocognitive networks in focal epilepsy correlates with domain-specific cognitive performance

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-10
Major/Subject
Mcode
Degree programme
Language
en
Pages
19
2669-2687
Series
JOURNAL OF NEUROSCIENCE RESEARCH, Volume 99, issue 10
Abstract
Understanding and diagnosing cognitive impairment in epilepsy remains a prominent challenge. New etiological models suggest that cognitive difficulties might not be directly linked to seizure activity, but are rather a manifestation of a broader brain pathology. Consequently, treating seizures is not sufficient to alleviate cognitive symptoms, highlighting the need for novel diagnostic tools. Here, we investigated whether the organization of three intrinsic, resting-state functional connectivity networks was correlated with domain-specific cognitive test performance. Using individualized EEG source reconstruction and graph theory, we examined the association between network small worldness and cognitive test performance in 23 patients with focal epilepsy and 17 healthy controls, who underwent a series of standardized pencil-and-paper and digital cognitive tests. We observed that the specific networks robustly correlated with test performance in distinct cognitive domains. Specifically, correlations were evident between the default mode network and memory in patients, the central-executive network and executive functioning in controls, and the salience network and social cognition in both groups. Interestingly, the correlations were evident in both groups, but in different domains, suggesting an alteration in these functional neurocognitive networks in focal epilepsy. The present findings highlight the potential clinical relevance of functional brain network dysfunction in cognitive impairment.
Description
Funding Information: This project is funded by the South‐Eastern Norway Regional Health Authority, project number 2016033, and is in partnership with the Centre for Digital Life Norway, supported by the Research Council of Norway's grant 248810. Publisher Copyright: © 2021 The Authors. Journal of Neuroscience Research published by Wiley Periodicals LLC.
Keywords
cognitive impairment, focal epilepsy, functional connectivity, graph theory, neurocognitive networks, RRID:SCR_002510, RRID:SCR_003550, RRID:SCR_004841, RRID:SCR_004849, RRID:SCR_007037, RRID:SCR_007292, RRID:SCR_013202, source EEG
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Citation
Hatlestad-Hall , C , Bruña , R , Erichsen , A , Andersson , V , Syvertsen , M R , Skogan , A H , Renvall , H , Marra , C , Maestú , F , Heuser , K , Taubøll , E , Solbakk , A K & Haraldsen , I H 2021 , ' The organization of functional neurocognitive networks in focal epilepsy correlates with domain-specific cognitive performance ' , JOURNAL OF NEUROSCIENCE RESEARCH , vol. 99 , no. 10 , pp. 2669-2687 . https://doi.org/10.1002/jnr.24896