The Memory Integrated Language Test: Cross-validation of a web-based performance validity test

The Memory Integrated Language Test (MIL) is a novel web-based performance validity test (PVT) with promising initial psychometric properties. This study cross-validated the MIL in a diagnostically diverse clinical sample using a criterion-grouping design. Three aims were examined: (a) Evaluate classification accuracy for identifying performance invalidity and determine cut scores maximizing sensitivity (≥.50) while maintaining specificity ≥.90; (b) examine psychometric properties across diagnostic groups and levels of cognitive impairment; and (c) assess construct validity. Participants were 177 adults (M_age = 35.68; M_education = 15.20; 63% female; 33% non-Hispanic White; 23% Hispanic; 26% Black/African American; 11% Asian; 7% other). Based on five independent criterion PVTs, participants were classified as valid (≤1 PVT failure, n = 154) or invalid (≥2 PVT failures, n = 23). The valid group was further categorized into mild cognitive impairment (n = 28), attention-deficit/hyperactivity disorder (n = 59), and psychiatric (n = 52) groups. In the overall sample, the MIL demonstrated outstanding classification accuracy (a significant area under the curve = .96), with a cutoff score of ≤44 (96% sensitivity/91% specificity). Across diagnostic groups, the MIL maintained outstanding classification accuracy (area under the curve = .90-.97) with strong sensitivity and specificity. Convergent validity analyses indicated expected associations with other memory-based PVTs, while discriminant validity analyses yielded weak associations with executive function and memory domains. Supplemental analysis using a ≥1 PVT failure threshold yielded acceptable classification accuracy (area under the curve = .78), with a cutoff score of ≤44 (53% sensitivity/96% specificity). Findings indicate that the MIL is a psychometrically robust freestanding PVT. (PsycInfo Database Record (c) 2026 APA, all rights reserved).