Linguistic study on the nature and assessment of Japanese specific language impairment

特殊语言障碍（SLI）被认为是一种语言习得障碍，发生在没有任何其他明显的认知、社会或神经缺陷的儿童身上。然而，关于日本特殊语言障碍儿童语言特征的研究却很少。我们对一名日本G-SLI儿童进行了详细的个案研究。G-SLI儿童被认为是SLI儿童的一个亚型，他们似乎不一致地操纵语法的核心方面，包括时态、一致标记和在被动句中分配主题角色。本研究结果提示日本存在G-SLI儿童。此外，日语G-SLI儿童的语言特征与其他语言相似，包括时态标记错误、格标记错误和被动语态困难。此外，我们还调查了3名日本G-SLI儿童在语法格方面的语法知识。结果表明，G-SLI儿童在案例分配方面的表现低于5名同龄正常发育儿童。研究结果还表明，他们在拼凑句子方面的表现差异最大。

Specific language impairment (SLI) has been said to be a disorder of language acquisition in children who do not have any other apparent cognitive, social, or neurological deficits that can account for their impairment. However, there have been few studies on the linguistic characteristics of Japanese SLI children.We conducted a detailed case study of a Japanese G-SLI child. G-SLI children are considered to be a subtype of SLI children, who appear to inconsistently manipulate core aspects of syntax, including tense, agreement marking, and assigning thematic roles in passive sentences. The results of this study suggested that there exist G-SLI children in Japanese. In addition, it is suggested that the linguistic characteristics of Japanese G-SLI children include errors of tense-marking, case-marking and difficulty with passives, similar to those reported in other languages.Moreover, we investigated the grammatical knowledge of 3 Japanese G-SLI children concerning grammatical Case. The results showed that the performance of the G-SLI children was poorer than that of 5 age-matched normally developing children in relation to Case assignment. The findings also demonstrated that their performance with scrambled sentences differed most substantially.