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In her keynote paper, Valian (2014) provides a comprehensive review of the literature that examines whether bilingual individuals outperform monolingual participants on various executive processing tasks. The author acknowledges that numerous factors contribute to the outcomes, such as variations in participants' profile, differences in target functions, as well as variants of tasks and procedures. She also says in her review that, on the one hand, researchers use different tasks to measure similar functions; while, on the other hand, each of these tasks target somewhat different aspects of executive processing. The most widely used tasks, such as the Stroop or flanker tasks, measure several components of executive functions simultaneously.
