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Updated: Aug 22, 2025
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Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
Published on: December 18, 2016
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Relationship between visuoperceptual functions and parietal structural abnormalities in temporal lobe epilepsy.
Elena Fonseca1, Silvana Sarria-Estrada2, Deborah Pareto3
1Epilepsy Unit, Neurology Department, Medicine Department, Vall d'Hebron University Hospital, Universitat Autònoma de Barcelona, Passeig Vall d'Hebron 119-129, 08035, Barcelona, Spain.
Brain Imaging and Behavior
|November 10, 2022
Summary
Temporal lobe epilepsy (TLE) patients show widespread brain volume loss, particularly in parietal regions. These gray and white matter changes correlate with impaired visuospatial cognitive functions.
Area of Science:
- Neuroimaging
- Epilepsy Research
- Cognitive Neuroscience
Background:
- Progressive gray matter volume reductions occur in temporal lobe epilepsy (TLE), often extending beyond the seizure focus.
- Evidence linking gray and white matter volume changes to multi-domain cognitive performance in TLE is limited.
Purpose of the Study:
- To investigate correlations between volumetric changes in parietal brain structures and visuospatial cognitive performance in TLE patients.
Main Methods:
- Cross-sectional study comparing 34 TLE patients and 30 healthy controls using 3D T1-weighted MRI at 3.0 T.
- Age and sex-adjusted linear regression models analyzed global and regional brain volumes and cortical thickness.
- Correlations assessed between brain volumes and standardized neuropsychological tests of visual memory, visuoperceptual, visuospatial, and visuoconstructive abilities.
Main Results:
- TLE patients exhibited smaller deep gray matter volumes (putamen, nucleus accumbens) and larger cerebrospinal fluid volume compared to controls.
- Significant correlations were found between visual memory and precuneus/inferior parietal cortical thickness.
- Visuoperceptual performance correlated with precuneus/supramarginal white matter volumes.
- Visuospatial skills linked to precuneus, postcentral, and inferior/superior parietal white matter volumes.
- Visuoconstructive performance associated with inferior parietal white matter volume.
Conclusions:
- Brain volume loss in TLE is widespread, affecting deep gray matter and extending to parietal regions.
- Volumetric reductions in parietal lobe gray and white matter are associated with deficits in visuospatial cognitive functions in TLE.
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