The mental ages of 51 mentally disabled children were measured using the Goodenough Draw-a-Man intelligence test. The children's writing and written language acquisition skills were also evaluated, and classified into one of eight skill levels. Analyses showed that participants could trace Japanese kana characters at about MA 4:0. After MA 4:6, participants could copy kana characters by eye, and some could write words made of kana characters on their own. Some with higher chronological ages could write simple sentences. From MA 4:6 to 5:6, children could write sentences with subjects and predicates. Beyond MA 5:6, participants could express their own ideas in writing without syntactic mistakes. After MA 6:6, children could write long sentences. However, some of these children were limited to writing sentences of fixed patterns. Based on these age-related trends, it appears that learning in mentally disabled children progresses when characters in words and sentences are recognized as meaningful, and that there is a strong link between acquisition of characters and written language.
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