2歳代の語彙発達 : 語彙チェックリストを用いた表出語彙の分析

概要

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This study examined 300 children aged 24-35 months to clarify expressive vocabulary development using the vocabulary checklist questionnaire. Children were classified into 4 periods: first period, 24-26 months; second period, 27-29 months; third period, 30-32 months; and fourth period, 33-35 months. We analyzed median and quartiles of expressive vocabulary and performed one-way analysis of variance to determine which periods differed significantly from other periods. As a result, median total expressive vocabulary was 238.0 in the first period, 423.0 in the second period, 508.0 in the third period, and 661.0 in the fourth period. A clear correlation was seen between total expressive vocabulary, noun vocabulary, verb vocabulary, adjective vocabulary and child age. No significant difference in total expressive vocabulary was evident between second and third periods. These results indicate an incubation period in which the expressive vocabulary is invariable. A significant difference was apparent between the second and third periods in the verb vocabulary, suggesting a qualitative change in the expressive vocabulary. However, the term of increasing verb vocabulary was shorter than that for the noun vocabulary, which previous studies have reported in children aged 18-30 months.