The Effect of Amount and Interaction Styles of Maternal Inputs on Early Vocabulary Acquisition : A Longitudinal Multilevel Modeling Perspective

어휘 습득에서 어머니의 언어적 입력의 양과 상호작용 유형의 영향 : 다층 모형의 적용

A sample of 322 18-month-old infants and their mothers were assessed longitudinally at 24 and 30 months. Maternal utterances and styles of linguistic interaction were measured during a 10 minute free play session. Mothers completed a vocabulary checklist for infants. Longitudinal data were analyzed by multilevel modeling. Results indicated that vocabulary increased with age of infants and the growth rate was highly predictable by the size of vocabulary at 18 months. The growth rate was strongly influenced by maternal questioning and feedback. The effect of the maternal linguistic input was constant with age. Gender differences in size of vocabulary did not vary systematically with age.