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Objective: The purpose of this study was to examine construct overlap between traditional executive functioning measures and the WISC-V Fluid Reasoning Index (FRI) in a pediatric epilepsy sample. Method: This study included 114 patients (56% female) with epilepsy (age 6–15 years) who were referred for neuropsychological assessment. The following data was collected retrospectively: WISC-V FRI, WISC-V Working Memory Index (WMI), Wisconsin Card Sorting Test (WCST), Delis-Kaplan Executive Function System Trails (DKEFS), D-KEFS or NEPSY verbal fluency. Parent ratings of attention, hyperactivity, and executive functioning on the Behavior Assessment System for Children and Behavior Rating Inventory of Executive Function were included. Results: Correlation analyses indicated that the FRI was significantly related to performance on Digit Span, Picture Span, WCST, and verbal fluency. Linear regression to predict Matrix Reasoning (MR) was significant (F (8, 32) = 3.916, p < 0.01) but was not uniquely accounted for by any single measure of executive functioning. In contrast, Digit Span and letter fluency both uniquely accounted for significant variance in Figure Weights (FW) scores (F (8, 32) = 4.383, p < 0.01). Conclusions: These findings demonstrate that the FRI on the WISC-V is significantly correlated with performance on executive functioning measures in pediatric epilepsy. While MR appears to be related to global executive functioning, FW is more associated with performance on serial digit repetition and phonemic fluency tasks. This may suggest that FW is more sensitive to dominant frontal lobe functioning; however, this would be contrary to adult findings on the WAIS-IV. The relationship of these findings with seizure variables will be discussed.
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