Turkish-speaking dyzygotic twins (n = 21) and singletons (n = 23) were tested through a standard articulation test to observe whether their consonant articulations were related to their vocabulary sizes, recorded through CDI forms, at age 3;0. Twins were observed to lag behind their singleton peers and performed below the norm level in their production. Vocabulary size failed to predict twins’ articulation scores although it predicted the scores of the singleton group. The results suggested that articulation was not related to vocabulary size in twins. Exposure to sibling language was discussed as an alternative risk factor.

中文翻译：

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辅音发音和词汇量：双胞胎与单胞胎

通过标准发音测试对讲土耳其语的异卵双胞胎 (n = 21) 和单胎 (n = 23) 进行了测试，以观察他们的辅音发音是否与通过 CDI 表格记录的词汇量有关，在 3;0 岁时。观察到双胞胎落后于单身同龄人，并且在生产中的表现低于正常水平。词汇量无法预测双胞胎的发音分数，尽管它预测了单胎组的分数。结果表明，双胞胎的发音与词汇量无关。接触同胞语言被讨论为替代风险因素。