A study by Professor Toshiharu Matsumoto of the Faculty of Education, Hirosaki University found that people with autism spectrum disorders (ASD) tend not to speak dialects.Social studies of this language investigated the use of dialects in ASD from this perspective.
This led me to think that not speaking a dialect might be related to ASD.Professor Matsumoto's survey first conducted a survey of children, people with intellectual disabilities, and ASD dialect use in two regions in the Tohoku region, and six additional special needs education teachers, mainly in western Japan.The result was that ASD dialect use was lower in all regions than in other cases.For example, at special needs schools in Kochi City, 2 out of 6 students were considered to speak Tosa dialect even one word, and 26 in non-AS, regarding the degree of use of Tosa dialect vocabulary and the corresponding common language vocabulary. There were 12 of them.It has been found that such a tendency is widespread in areas where dialects are used to some extent, regardless of east or west.
In this research, I dared to investigate ASD based on the dualism of non-ASD, but in reality, the two are not clearly separated, and many have habitual shades.Therefore, it is expected that further promotion of such research will lead to a better understanding of ASD, which still has many unclear points.
Source:[Researchmap] Regarding the non-use of dialects in the autism spectrum-Interpretation of dialects based on the social function theory- (PDF)
Interpretation of dialect non-use of autism spectrum disorder From one language acquisition to proper use of dialect and common language-(PDF)