Evidence map›Paper›PMID 42470665›Full record

ArticleEpilepsia2026

Ventral anterior thalamic dysfunction distinguishes seizure generalization in temporal lobe epilepsy.

Stacy N Hudgins, Michael R Sperling, Hasan Ayaz, Joseph I Tracy

Abstract read
In one paragraph

Article in Epilepsia, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

4 authors.

Stacy N HudginsSchool of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, Pennsylvania, USA.ORCID https://orcid.org/0000-0002-8832-467X
Michael R SperlingJefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.ORCID https://orcid.org/0000-0003-0708-6006
Hasan AyazSchool of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, Pennsylvania, USA.ORCID https://orcid.org/0000-0001-5514-2741
Joseph I TracyJefferson Comprehensive Epilepsy Center, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.ORCID https://orcid.org/0000-0001-5260-3290

Funding

Model Development for Prediction of Surgical Outcome in Temporal Lobe Epilepsy Patients: Incorporation of the Correlation between Post-Surgical Reorganization Phenotypes and Pre-Surgical DataR01NS112816 · NINDS · THOMAS JEFFERSON UNIVERSITY · PI TRACY, JOSEPH I. · 2019 to 2023
$2.3M
NIH HHS R01 NS112816-01NINDS NIH HHS R01 NS112816
6 · The paper itself

Abstract

objectiveFocal-to-bilateral tonic-clonic seizures (FBTCS) in temporal lobe epilepsy (TLE) involve thalamocortical networks, yet the functional integrity and role of specific thalamic subregions in seizure generalization remain unclear. In this cross-sectional study, we investigated whether thalamic subregion functional connectivity patterns distinguish TLE patients with and without FBTCS and tested for laterality-specific differences between right TLE (RTLE) and left TLE (LTLE.

methodsWe analyzed resting-state functional magnetic resonance imaging (fMRI) data from 166 patients with TLE (71 RTLE, 95 LTLE; 120 FBTCS+, and 46 FBTCS-) and 119 healthy participants. Thalamic parcellation identified eight bilateral regions of interest. We computed graph theory measures of regional segregation, connection density, and integration, as well as intrinsic connectivity contrast to characterize thalamic subregion network topology. Sensitivity analyses controlled for pathology subgroup and anti-seizure medication burden.

resultsTLE patients exhibited reduced cross-hemispheric functional connectivity between bilateral ventral anterior (VA) thalamic regions compared with controls. Compared with patients with LTLE, patients with RTLE showed more pronounced ipsilateral VA hypoconnectivity and more disrupted nodal topology (clustering coefficient, degree centrality, local efficiency) in the ipsilateral VAia. Within RTLE, FBTCS+ patients (vs FBTCS-) showed ipsilateral connectivity reductions and cross-hemispheric VA reductions that increased with illness duration. Within LTLE, FBTCS+ patients (vs FBTCS-) showed bilateral connectivity increases in the ventral posterior medial subregion. Sensitivity analyses confirmed that these findings were robust across pathology subtypes and independent of anti-seizure medication burden. SIGNIFICANCE: These findings provide initial evidence that intra-thalamic functional connectivity, particularly within the bilateral VA complex, is associated with FBTCS history in TLE and varies with lateralization of seizureonset. The observations may represent a biomarker for FBTCS, but whether this is causal or an epiphenomenon of this seizure type remains to be determined.

Indexed as

Epilepsy, Temporal LobeSeizuresVentral Thalamic NucleiAdultCross-Sectional StudiesFemaleFunctional LateralityHumansMagnetic Resonance ImagingMaleMiddle AgedNeural PathwaysYoung Adultfocal‐to‐bilateral tonic–clonic seizuresfunctional connectivitygraph theoryneuromodulationresting‐state fMRIthalamus

Identifiers

PMID42470665
PMCPMC13675782

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.