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Assessment of Naming in Non-native English Speakers with Epilepsy

Abstract Objectives: Naming assessment is a core component of neuropsychological evaluation, particularly in the surgical work up for patients with pharmacologically refractory epilepsy. Specifically, naming deficits are typically associated with left, but not right hemisphere epilepsy, thereby assisting with lateralization of seizure onset. We sought to determine whether bilingual (English as second language, ESL) and monolingual epilepsy patients with comparable education, intelligence, and objective vocabulary performance would perform similarly on standard naming measures, and whether ESL patients would demonstrate laterality effects in naming, similar to that observed in monolingual patients. Methods: Participants were 242 adults with epilepsy (186 native, 56 ESL) who underwent neuropsychological evaluation and obtained normal range or higher scores on the Wechsler Adult Intelligence Scale (R/III/IV) Vocabulary subtest (scaled score≥8). Groups were compared on demographic factors and language performances (i.e., Boston Naming Test, Auditory & Visual Naming Test, word reading, fluency). Results: Groups did not differ with respect to age, education, FSIQ, vocabulary, reading, or verbal fluency. However, ESL speakers earned poorer scores than native English speakers on all naming measures. Moreover, among ESL participants with unilateral epilepsy, a significant proportion of right hemisphere patients scored below cutoff for impairment. This contrasted with the more typical finding among native English speakers, whereby a significant proportion of left patients demonstrated naming impairment. Conclusions: These results underscore the complexity of verbal assessment in bilinguals, suggesting that naming performances by ESL individuals, even those considered proficient, with strong performances on other English verbal measures, cannot be interpreted by the same standards applied for native speakers. (JINS, 2018, 24, 1057–1063)