The purpose of the present study was to develop the ability of a child with mental retardation to read dakuon kana syllables. Two phonetic syllabaries in the Japanese language, known as kana, are written differently but pronounced the same: hiragana, which is written in a cursive style, and katakana, which is written in a square style. Dakuon characters are the voiced consonants g, z, d, and b in these syllabaries. The subject was trained with a matching-to-sample procedure to match auditory stimuli (spoken words or syllables) to visual stimuli (written words or syllables). The subject was to learn stimulus equivalence, that is, the equivalence between these two types of stimuli, and to develop an oral reading ability. In Experiment A, some words beginning with dakuon characters were uttered and their written hiragana counterparts shown simultaneously. The subject was trained to match the spoken words to the written hiragana. After the subject learned to read the words orally, only the first syllable of the word was presented to the subject. It was found that the subject was able to read the syllables orally. In Experiment B, some dakuon syllables were uttered and their written katakana counterparts were shown simultaneously to the subject. Using a superimposition method, the katakana syllables were at first accompanied by their hiragana counterparts which the subject had already learned to read in Experiment A. Then the hiragana syllables were gradually faded out. The subject learned to match the spoken syllables to their written katakana counterparts without a position preference. Eventually the subject acquired the ability to read the dakuon katakana syllables.
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