Wisconsin card sorting test in children with temporal lobe epilepsy

Area of Science:

• Neuroscience
• Pediatric Neurology
• Cognitive Psychology

Background:

• Frontal lobe dysfunction is a known complication in epilepsy.
• The specific origins and early manifestations of this dysfunction in pediatric temporal lobe epilepsy (TLE) remain unclear.
• Hippocampal atrophy (HA) is a common finding in some TLE patients.

Purpose of the Study:

• To investigate the origin of frontal lobe dysfunction in pediatric TLE patients using the Wisconsin Card Sorting Test (WCST).
• To compare WCST performance in TLE patients with hippocampal atrophy (HA) versus those without structural lesions (NSL), frontal lobe epilepsy (FLE) patients, and normal controls (N).
• To explore the relationship between WCST performance and clinical factors like age at initial status convulsivus.

Main Methods:

• WCST, Paired Verbal Association Learning Test (PVALT), and Benton Visual Retention Test (BVRT) were administered to 19 children with TLE (12 HA, 7 NSL), 15 with FLE, and age-matched controls.
• Performance metrics included categories achieved and perseverative errors on the WCST.
• Statistical analyses were used to compare groups and identify correlations.

Main Results:

• Both HA and FLE groups showed significantly fewer categories and more perseverative errors on the WCST compared to NSL and N groups.
• WCST category achievement in the HA group inversely correlated with age at initial status convulsivus.
• No significant differences in PVALT or BVRT performance were found between HA and FLE groups.

Conclusions:

• Frontal lobe dysfunction, as measured by the WCST, is present in pediatric TLE patients with hippocampal atrophy, even with limited seizure history or temporal-frontal interference.
• This dysfunction appears to originate from early insults and becomes apparent after prefrontal region maturation.
• Findings highlight the persistence of prefrontal dysfunction in mesial TLE from early stages.