The effects of using two varieties of one language on cognition

Abstract Although the question of whether and how bilingualism affects executive functions has been extensively debated, less attention paid to cognitive abilities speakers different varieties same language, in linguistic situations such as bidialectalism diglossia. Similarly bilingual situation, diglossia have two language that are active at time. However, these argued potentially provide varied, possibly fewer, opportunities for mixing or switching between varieties, which may turn lead outcomes than those reported bilingualism. Here we review available evidence on effects cognition, evaluate it relation theories cognition. We conclude investigations bilingualism, must take into account conversational context and, particular, this affords.