Rescorla L, Mirak J, Singh L
Department of Psychology, Bryn Mawr College, PA 19010, USA.
J Child Lang. 2000 Jun;27(2):293-311. doi: 10.1017/s030500090000413x.
Vocabulary growth from 2;0 to 3;0 was studied in 28 late talkers using expressive vocabulary inventories reported bimonthly on the Language Development Survey (LDS). Group milestones were 18 words at 2;0, 89 words at 2;6, and 195 words at 3;0. A sub-group of 11 children (Group 1) showed a rapid vocabulary spurt between 2;2 and 2;8, reached the 150-180 word mark by 2;6, and attained the LDS ceiling of about 300 words by 2;10. In contrast, the 17 children in Group 2 still had a mean vocabulary of fewer than 30 words at 2;6, had less of a vocabulary spurt when they did start acquiring words, and attained the 150-180 vocabulary mark at 3;0. All 3;0 language outcome measures were significantly predicted by LDS vocabulary size from 2;2 to 2;4.
使用语言发展调查问卷（LDS）每两个月报告一次的表达性词汇量表，对28名说话较晚的儿童从2岁到3岁的词汇增长情况进行了研究。该组的里程碑分别是2岁时18个单词，2岁6个月时89个单词，3岁时195个单词。11名儿童组成的一个亚组（第1组）在2岁2个月到2岁8个月之间词汇量迅速增长，到2岁6个月时达到150 - 180个单词的水平，到2岁10个月时达到LDS约300个单词的上限。相比之下，第2组的17名儿童在2岁6个月时平均词汇量仍不到30个单词，在开始学习单词时词汇量增长较少，到3岁时达到150 - 180个单词的水平。所有3岁时的语言结果指标都由2岁2个月到2岁4个月期间LDS的词汇量显著预测。
