The phonological deficit hypothesis is the most convincing hypothesis for developmental dyslexia in English-speaking countries. In addition, the phonological deficit hypothesis has been reported to be related to specific language impairment (SLI). It is thought that phonological short-term memory affects vocabulary, which has also been reported to be the cause of SLI. However, it is not clear how phonological deficit affects language disorder in developmental dyslexia and SLI. Therefore, in

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... study we investigated 519 primary school children, and carried out cognitive and attainment tasks in relation to reading/writing and language development. The purpose of this study is to clarify the effects of the phonological deficit on developmental dyslexia and SLI.