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Temporal lobe epilepsy disrupts naming abilities by affecting language networks. Improved naming correlates with stronger functional connectivity in these brain regions, especially with later epilepsy onset.

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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Cognitive Neurology

Background:

  • Naming impairments are a significant challenge for individuals with temporal lobe epilepsy (TLE).
  • The underlying neural mechanisms disrupting temporal lobe language networks in TLE remain unclear.

Purpose of the Study:

  • To investigate the functional magnetic resonance imaging (fMRI) activation and task-related functional connectivity of left temporal lobe language networks.
  • To examine the relationship between these neural measures and clinical naming performance, alongside epilepsy characteristics.

Main Methods:

  • Functional MRI (fMRI) was employed in 59 adult TLE patients (35 with left TLE) and 32 healthy controls during auditory and visual naming tasks.
  • Seed-based whole-brain task-related functional connectivity analyses were performed using time series from left posterior inferior temporal lobe activations.
  • Correlational analyses assessed associations between fMRI measures, naming scores, age of epilepsy onset, and epilepsy duration.

Main Results:

  • Auditory naming activated the left posterior inferior temporal gyrus, while visual naming activated the left fusiform gyrus.
  • Left inferior temporal gyrus, thalamus, and supplementary motor area activations during auditory naming, and left fusiform activations during visual naming, correlated with better naming performance.
  • Stronger functional connectivity between left posterior inferior temporal regions and other brain areas was linked to better naming across all groups.
  • In left TLE patients, functional connectivity increased with later age of onset and shorter disease duration.

Conclusions:

  • Early seizure onset and prolonged epilepsy duration may disrupt temporal lobe network recruitment, contributing to naming deficits in TLE.
  • Task-related functional connectivity is a key neural correlate of naming performance in TLE.
  • These findings highlight the complex interplay between epilepsy characteristics and language network function.