Vocabulary growth in deaf children: a systematic review and case study in language acquisition

Abstract

This study aims to analyze vocabulary development in deaf children and identify effective intervention strategies. Through a systematic literature review using the PRISMA method, this study examines research published between 2000-2024 on deaf children aged 0-18 years. Data were collected from various databases including PubMed, ERIC, and PsycINFO, then thematically analyzed to identify patterns and synthesize findings. The results show that vocabulary development in deaf children is influenced by factors such as early language exposure, neurobiological aspects, and social interaction. Bilingual-bimodal approaches, the use of assistive hearing technology, and family involvement have proven effective in supporting vocabulary acquisition. This study also reveals the potential of deaf children to develop conceptual vocabulary comparable to hearing children. In conclusion, vocabulary development in deaf children is a complex process that requires a holistic and interdisciplinary approach. Further research is needed, particularly long-term longitudinal studies and more rigorous intervention evaluations, to enhance understanding of vocabulary development trajectories and optimize supporting strategies.