Objective: To investigate the performance of epilepsy patients diagnosed with unilateral mesial temporal sclerosis (MTS) on a nonverbal fluency measure using the five-point test (FPT). Our secondary aim was to investigate any differences in FPT and verbal fluency test (VFT) scores between left and right MTS. We hypothesized that scores on the FPT, commonly utilized in the assessment of individuals with presumed frontal lobe damage, would be lower in patients with temporal lobe dysfunction.
Method: One hundred eighty patients diagnosed with temporal lobe epilepsy (TLE) and 150 healthy controls (HCs) were included in this retrospective study. We analyzed correlations between scores obtained from FPT and phonemic and semantic VFT, and scores according to the lateralization of epileptogenic focus in the TLE group.
Results: Overall, the TLE patients had lower performance than the HCs on the FPT, but no differences were observed on perseverance rates ( 0.992). Statistically significant difference was found in both sections of the VFT in association with the lateralization of the epileptogenic zone ( 0.001). As for the FPT, differences did not reach statistical significance ( 0.0857).
Conclusions: Our results support the hypothesis of involvement of the temporal areas on tasks such as the FPT, despite the lack of a lateralizing effect. Our findings also contribute to better understanding of the role of the FPT in assessment of executive function in patients with unilateral MTS, and provide further psychometric data on a native Brazilian population.
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