The importance of cognitive factors, in particular, working memory, stands out as a crucial thread that connects the learning and retention processes in the complex web of second language acquisition. The limited capacity mechanism known as working memory, which is in charge of temporarily storing and manipulating information, is essential to the acquisition of vocabulary. Therefore, this study aims to explore the relationship between working memory and vocabulary learning in adult second language (L2) learners. The investigation engaged 40 adult participants who undertook a series of tasks designed to probe their working memory capabilities and assess their vocabulary learning outcomes. These tasks included a comprehensive questionnaire to gather demographic and linguistic background data, a Corsi block tapping task to measure working memory span, a targeted vocabulary learning session, and a subsequent word test to evaluate retention and application. The result showed a strikingly strong correlation between working memory capacity and vocabulary learning efficiency among L2 learners.
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