Data from: Thalamus and focal to bilateral seizures: a multi-scale cognitive imaging study
Caciagli, Lorenzo et al. (2020), Data from: Thalamus and focal to bilateral seizures: a multi-scale cognitive imaging study, Dryad, Dataset, https://doi.org/10.5061/dryad.2bvq83bm8
To investigate the functional correlates of recurrent secondarily generalized seizures in temporal lobe epilepsy (TLE), using task-based fMRI as a framework to test for epilepsy-specific network rearrangements. As the thalamus modulates propagation of temporal-lobe onset seizures and promotes cortical synchronization during cognition, we hypothesized that occurrence of secondarily generalized, i.e. focal to bilateral tonic-clonic seizures (FBTCS), would relate to thalamic dysfunction, altered connectivity and whole-brain network centrality.
FBTCS occur in a third of patients with TLE and are a major determinant of disease severity. In this cross-sectional study, we analyzed 113 patients with drug-resistant TLE (55 left/58 right), who performed a verbal fluency fMRI task that elicited robust thalamic activation. Thirty-three patients (29%) had experienced at least one FBTCS in the year preceding the investigation. We compared patients with TLE-FBTCS to those without FBTCS via a multi-scale approach, entailing analysis of SPM12-derived measures of activation, task-modulated thalamic functional connectivity (psychophysiological interaction), and graph-theoretical metrics of centrality.
Individuals with TLE-FBTCS had less task-related activation of bilateral thalamus, with left-sided emphasis, and left hippocampus than those without FBTCS. In TLE-FBTCS, we also found greater task-related thalamotemporal and thalamo-motor connectivity, and higher thalamic degree and betweenness centrality. Receiver operating characteristic curves, based on a combined thalamic functional marker, accurately discriminated individuals with and without FBTCS.
In TLE-FBTCS, impaired task-related thalamic recruitment coexists with enhanced thalamotemporal connectivity and whole-brain thalamic network embedding. Altered thalamic functional profiles are proposed as imaging biomarkers of active secondary generalization.
Details in relation to data collection and processing details are provided in the main manuscript text. The uploaded material contains:
-Supplementary Methods (Appendix e-1)
-Supplementary Results (Appendix e-2)
-Two supplementary Figures (Figure e-1, Figure e-2)
-Two supplementary Tables (Table e-1, Table e-2)
-Additional references (e-References), cited in the supplementary material only.
No specific usage notes.
Wellcome Trust, Award: 083148, 079474
Epilepsy Society, Award: N/A
Brain Research UK, Award: 14181
UCLH Biomedical Research Centre, Award: N/A
National Institute for Health Research University College London Hospitals Biomedical Research Centre, Award: N/A
European Academy of Neurology, Award: N/A
Österreichische Gesellschaft für Neurowissenschaften
Medical Research Council, Award: MR/M00841X/1
National Institute of Neurological Disorders and Stroke, Award: R01-NS099348-01
Alfred P. Sloan Foundation
John D. and Catherine T. MacArthur Foundation