Psychologists’ theoretical implications have led to several studies investigating L1 and L2 acquisition. This research examines Vygotsky’s (1978, 1987a, 1987b, 1997, 2012) interactionist view of language acquisition and draws on a critical review methodology to assess the relevance of Vygotsky’s (1978) interactionist theory in L1 and L2 acquisition. To assess whether Vygotsky’s (1978) theory of language acquisition is effective, the selected articles will be critically examined. This research indicates that the articles under review prove the validity of Vygotsky’s (1978) arguments. However, they did not address how children from non-western cultures and those with disabilities acquire language, on the one hand, and the role of self-regulatory speech in language acquisition, on the other hand. Though Chomsky’s (1965) Universal Grammar and Skinner’s (1957) behaviourist theory have inspired scholars, linguists, and researchers to examine L1 and L2 acquisition deeply, Vygotsky’s (1978) interactionist theory explains how social interaction is crucial to a child’s cognitive development. The theory’s emphasis on learner-centeredness may significantly empower language teachers if implemented wisely into the L2 Curriculum. To maximize the effectiveness of social interaction in L2 learning, more profound and longitudinal research on the integration of zone of proximal development and scaffolding into teaching is required. Though teacher and peer interactions in L2 learning have been studied empirically, the types of social interactions that enhance language acquisition need to be assessed. Educators, researchers, and scholars must investigate how social interactions affect the cognitive and linguistic development of learners. Educators, researchers, and scholars must investigate how social interactions affect the cognitive and linguistic development of learners.
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