Lesion-Specific Language Network Alterations in Temporal Lobe Epilepsy

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• Temporal lobe epilepsy (TLE) can impair language function.
• The specific impact of different epileptogenic lesions on language networks is not well understood.
• Functional connectivity alterations in the language connectome are hypothesized to vary by lesion type.

Purpose of the Study:

• To investigate how different epileptogenic lesions in TLE affect the functional language connectome.
• To compare language network alterations in patients with mesiotemporal sclerosis, tumors, and nonlesional TLE.
• To identify potential imaging biomarkers for language function in TLE.

Main Methods:

• Task-based functional MRI (fMRI) was used in 101 TLE patients and 22 healthy controls.
• Participants underwent fMRI during language tasks.
• Analysis included laterality indices and functional connectivity between language areas.

Main Results:

• fMRI activation laterality indices did not differentiate patient groups.
• Functional connectivity analysis revealed the most significant alterations in left mesiotemporal sclerosis.
• Connectivity strength correlated with naming and verbal fluency, suggesting network integrity impacts language performance.

Conclusions:

• Different TLE pathologies are associated with distinct functional language connectome alterations.
• fMRI functional connectivity analysis provides novel insights into language organization in TLE.
• These findings support personalized treatment strategies for epilepsy patients based on imaging biomarkers.