Signs for Developing Reading Sign Language and Reading Development in Deaf and Hard-of-Hearing Children

Reading development is supported by strong language skills, not least in deaf and hard-of-hearing (DHH) children. Regional Special Needs Schools (RSNS) in Sweden have a bilingual curriculum, that is, DHH pupils at these schools learn Swedish Sign Language and written and/or spoken Swedish. The work in the present thesis investigates reading development in DHH children who attend these schools and who are learning to read. The primary aim of the present work was to investigate whether the reading skills of DHH signing children can be improved via computerized sign language based literacy training aimed at strengthening the connections between sign language and written language. Another aim was to investigate concurrent and longitudinal associations between skills in reading, sign language, and cognition in this population. The results indicate that sign language skills support developing reading skills in RSNS pupils (Paper I and Paper IV). In particular, sign language based literacy training appears to support development of word reading (Paper IV). In addition, awareness of the sublexical structure of sign language seems to assist word reading (Paper I). Interestingly, the ability to imitate manual gestures was related to reading skills. More specifically, precision of imitation of unfamiliar signs was associated with development of word reading (Paper IV) and precision of imitation of familiar signs, i.e., vocabulary, seemed to be associated with developing reading comprehension (Paper IV). Results also suggest that working memory and Theory of Mind (ToM) are related to reading comprehension in RSNS pupils (Paper III). In addition to these findings relating to reading development, results also suggest that sign language experience enhance the establishment of representations of manual gestures (Paper II), and that progression in ToM seem to be typical, although delayed, in RSNS pupils who are learning to read (Paper III). Taken together, the associations revealed between sign language skills and reading development support the notion that sign language skills may provide a foundation for promotion of reading skills in DHH signing children. Thus, interventions that support development of sign-based representations and their manipulation and use in written language processing, may improve reading skills in this population. To account for the present findings, a model of written language processing is proposed. Working memory has a central role in integrating environmental stimuli and language-mediated representations, and thereby provides a platform for cross-modal language processing and multimodal language development.