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01-12-2023 | Epilepsy | Original Article

Impaired interhemispheric synchrony and effective connectivity in right temporal lobe epilepsy

Authors: Ke Shi, Lu Yu, Yiling Wang, Zhekun Li, Chunyan Li, Qijia Long, Jinou Zheng

Published in: Neurological Sciences | Issue 5/2024

Abstract

Background

The brain functional network plays a crucial role in cognitive impairment in temporal lobe epilepsy (TLE). Based on voxel-mirrored homotopic connectivity (VMHC), this study explored how directed functional connectivity changes and is associated with impaired cognition in right TLE (rTLE).

Methods

Twenty-seven patients with rTLE and twenty-seven healthy controls were included to perform VMHC and Granger causality analysis (GCA). Correlation analysis was performed based on GCA and cognitive function.

Results

Bilateral middle frontal gyrus (MFG), middle temporal gyrus, dorsolateral superior frontal gyrus (SFGdor), and supramarginal gyrus (SMG) exhibited decreased VMHC values in the rTLE group. Brain regions with altered VMHC had abnormal directed functional connectivity with multiple brain regions, mainly belonging to the default mode network, sensorimotor network, and visual network. Besides, the Montreal Cognitive Assessment (MoCA) score was positively correlated with the connectivity from the left SFGdor to the right cerebellum crus2 and was negatively correlated with the connectivity from the left SMG to the right supplementary motor area (SMA) before correction. Before correction, both phasic and intrinsic alertness reaction time were positively correlated with the connectivity from the left MFG to the left precentral gyrus (PreCG), connectivity from the left SMG to the right PreCG, and the connectivity from the left SMG to the right SMA. The executive control effect reaction time was positively correlated with the connectivity from the left MFG to the left calcarine fissure surrounding cortex before correction.

Conclusion

The disordered functional network tended to be correlated with cognition impairment in rTLE.

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Title: Impaired interhemispheric synchrony and effective connectivity in right temporal lobe epilepsy
Authors: Ke Shi
Lu Yu
Yiling Wang
Zhekun Li
Chunyan Li
Qijia Long
Jinou Zheng
Publication date: 01-12-2023
Publisher: Springer International Publishing
Keyword: Epilepsy
Published in: Neurological Sciences / Issue 5/2024
Print ISSN: 1590-1874
Electronic ISSN: 1590-3478
DOI: https://doi.org/10.1007/s10072-023-07198-6

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Impaired interhemispheric synchrony and effective connectivity in right temporal lobe epilepsy

Abstract

Background

Methods

Results

Conclusion

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