This contribution is devoted to a Greek-Arabic Lectionary originally belonging to St Catherine on Mount Sinai and nowadays dismembered among three different libraries. The retrieval of the main nucleus of the original codex in London, in the library of the School of Oriental and African Studies, was followed by the reconnection with its other fragments – linked to Constantin von Tischendorf – in Cambridge and St. Petersburg.
Approximately half of the world's population is bilingual or multilingual. The bilingual advantage theory claims that the constant need to control both known languages, that are always active in the brain, to use the one suitable for each specific context improves cognitive functions and specifically executive functions. However, some authors do not agree on the bilingual effect, given the controversial results of studies on this topic. This systematic review aims to summarize the results of studies on the relationship between bilingualism and executive functions.
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