Research Findings: This study examines lexical- and sentence-level dimensions of academic language to describe teachers' natural use of academic language and its association with vocabulary growth in 489 at-risk 4-year-olds enrolled in Head Start preschool classrooms. Using transcripts derived from video recordings of book-reading sessions in 52…

Researchers consistently report that children from low socioeconomic status (SES) families have, on average, smaller vocabularies as assessed by measures of existing vocabulary knowledge than children from higher SES families. Yet, few studies have examined the word-learning process of children from low SES families. The present study was an…