B – 95 Evaluating the Poreh Nonverbal Memory Test as a Modality-Pure Measure of Nonverbal Memory in Epilepsy: Preliminary Evidence from Neuropsychological Correlates

Abstract Objective This preliminary study explored the validity of the Poreh Nonverbal Memory Test (PNMT) as a modality-specific measure of nonverbal memory in individuals with epilepsy. Method 17 participants (mean age = 46.35, SD = 13.47; 65% female) with epilepsy completed the Rey Complex Figure Test (ROCF), the PNMT, and the Rey Auditory Verbal Learning Test (RAVLT). Results Spearman correlation analyses between planning indices of the ROCF revealed that the Bennet-Levi index demonstrated stronger associations with ROCF delayed recall (rs = .79) whereas the Savage index showed moderate correlations (rs = .63). This suggests that the Bennet-Levi index provides a more sensitive assessment of visual-spatial planning. Both PNMT learning and delay scores were highly correlated with ROCF delayed recall (rs = –.68 and –.84, respectively), supporting convergent validity between the two nonverbal memory tests. However, PNMT delay scores showed modest correlation with RAVLT delay scores (rs = –.35), while ROCF delay was substantially associated with RAVLT delay scores (rs = –.50). This suggests that the PNMT reflects a modality-pure measure of nonverbal memory, with limited verbal mediation. PNMT scores also showed moderate associations with ROCF planning indices (e.g., Bennet-Levi: rs = –.63), indicating a role for nonverbal strategic encoding during spatial learning, despite the PNMT’s surface-level independence from executive demands. Conclusion This study provides preliminary evidence supporting the PNMT as a valid and specific measure of nonverbal memory. Minimal association with verbal memory tasks, coupled with strong alignment with visual-spatial recall, presents a promising tool for functional neuroimaging studies targeting right-hemisphere memory networks, including hippocampal circuitry.