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Abstract #0889

Distance-enriched functional connectomics in drug-resistant temporal lobe epilepsy

Sara Larivière1, Yifei Weng2, Reinder Vos de Wael1, Zhengge Wang3, Andrea Bernasconi4, Neda Bernasconi4, Zhiqiang Zhang2, and Boris Bernhardt1

1Multimodal Imaging and Connectome Analysis Laboratory, McConnell Brain Imaging Centre, Montreal Neurological Institute and Hospital, McGill University, Montreal, QC, Canada, 2Department of Medical Imaging, Jinling Hospital, Nanjing University School of Medicine, Nanjing, China, 3Department of Radiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China, 4NeuroImaging of Epilepsy Laboratory, McConnell Brain Imaging Centre, Montreal Neurological Institute and Hospital, McGill University, Montreal, QC, Canada

Temporal lobe epilepsy (TLE) is increasingly reconceptualised as a network disorder, with a growing literature suggesting concurrent structural and functional changes in large-scale network organization. In the current work, we developed a novel framework consolidating topological and spatial properties of brain networks and applied it to unveil shifts in the connectional distance distribution in TLE. Patients showed marked connectivity reductions in ipsilateral temporal, insular, and dorsomedial prefrontal networks—regions which coincide with high-degree, transmodal systems. Importantly, distance reductions occurred independently of cortical atrophy but were mediated by microstructural damage, thus emphasizing the clinical importance of physically-grounded measures of functional connectivity.

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