The purpose of the present study was to clarify developmental features of written spelling errors made by children who are deaf. Compositions (
N=212) written by 179 pupils who were deaf and in classes at an elementary school for children who are deaf were analyzed, and the spelling errors classified into 8 categories based on the sound features of their mistakes: (a) consonants, (b) vowels, (c) the Japanese syllabic nasal (
hatsu-on; the consonant), (d) double consonants (
soku-on; the Japanese silent mora between 2 adjacent moras), (e) contracted sounds (
yo-on; a kana character in which a high front vowel in the preceding syllable changes to a semivowel and adds a new vowel), (f) long vowels (
cho-on; a syllable with a prolonged sound and another related sound), (g) voiced sound marks (
dakuten; a double mark written on the upper right corner of a kana character), and (h) other. The analysis revealed that the 7- to 8-year-old children’s most common mistake (approximately 30% of their mistakes) was the voiced sound mark (
dakuten); fewer mistakes were made with vowels and Japanese special syllabic notations such as double consonants and long vowels. The most common errors of the children who were 9 to 10 years old were also the voiced sound marks (
dakuten), followed by errors in vowels and consonants. These children made fewer mistakes in the other Japanese special syllabic notations than the children in the younger age group. Voiced sound marks (
dakuten) were also the most common mistake (approximately 30%) made by the 11- to 12-year-old children, followed by mistakes in consonants and vowels. These older children made even fewer mistakes in the other Japanese special syllabic notations than the 2 younger age groups. The present results indicate that mistakes in voiced sound marks (
dakuten) were common throughout the age span studied, whereas the older children made fewer mistakes in other Japanese special syllabic notations.
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