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The present study aimed (a) to determine whether the bilingual advantage in false-belief (FB) understanding is replicated when considering socio-economic status and (b) to assess whether conflict inhibition and/or working memory underpin the advantage, if there is one. Monolingual preschoolers (24 English monolinguals and 24 French monolinguals) and 24 English-French bilingual counterparts received FB, conflict inhibition, working memory, and verbal ability tests. Monolingual and bilingual groups were equivalent on parental income and education, measured through a parental questionnaire. Results indicated that bilinguals significantly outperformed monolinguals on FB, but only after statistically controlling for language proficiency and age. Working memory likely compensated for the potential negative impact of bilinguals' low language proficiency on FB.
