In a toddler aged two years and 11 months,showing 200 types of utterance at the 1-word level but no multiple word utterances(≥2-word utterances),we performed 2- and 3-word utterance training.Prior to training,a work checklist was produced to clarify comprehended and expressed words,and nouns,verbs,and adjectives that can be expressed were extracted.Based on the extracted words,the patterns of 2- and 3-word sentences were determined,and the extracted words were arranged as symbols on the overlay of the VOCA.In addition,objects(models,miniatures)of the extracted words were prepared.The subject was asked to perform matching-to-sample tasks.To measure training effects,an experimental design in a case was used. As a result,the oral naming rate for 2- and 3-word sentences was almost 0% during the baseline period.In theconfirmation period,the oral naming rate was almost 100% for 2-word sentences,11% for 3-word sentences using an action word task,but about 89% for the other 3-word sentence tasks.An interview with the mother showed that the appearance rate of multiple sentences,which were used in the training,in daily life was more than 90%.
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