Objective: This study was designed to evaluate the effect of limited English proficiency (LEP) on neurocognitive profiles.
Method: Romanian (LEP-RO; = 59) and Arabic (LEP-AR; = 30) native speakers were compared to Canadian native speakers of English (NSE; = 24) on a strategically selected battery of neuropsychological tests.
Results: As predicted, participants with LEP demonstrated significantly lower performance on tests with high verbal mediation relative to US norms and the NSE sample (large effects). In contrast, several tests with low verbal mediation were robust to LEP. However, clinically relevant deviations from this general pattern were observed. The level of English proficiency varied significantly within the LEP-RO and was associated with a predictable performance pattern on tests with high verbal mediation.
Conclusions: The heterogeneity in cognitive profiles among individuals with LEP challenges the notion that LEP status is a unitary construct. The level of verbal mediation is an imperfect predictor of the performance of LEP examinees during neuropsychological testing. Several commonly used measures were identified that are robust to the deleterious effects of LEP. Administering tests in the examinee's native language may not be the optimal solution to contain the confounding effect of LEP in cognitive evaluations.
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