From terrible twos to sassy sixes: The development of vocabulary and executive functioning across early childhood

Across the early childhood period of development, young children exhibit considerable growth in their executive functioning (EF) and vocabulary abilities. Understanding the developmental trajectory of these seemingly interrelated processes is important as both early vocabulary and EF have been shown to predict critical academic and socio-emotional outcomes later in childhood. Although previous research suggests that EF and vocabulary are correlated in early childhood, much of the existing longitudinal research has focused on unidirectional relations among preschool child samples. The current large-scale study, therefore, sought to examine whether children's vocabulary and EF abilities are bidirectionally related over time across four measurement waves in early childhood (i.e., at ages 2, 3, 4, and 6). At each timepoint, children's vocabulary skills were positively correlated with their concurrent EF abilities. After controlling for child sex and maternal education status, the best-fitting, cross-lagged panel model was a unidirectional model whereby children's early vocabulary scores predicted their later EF performance at each timepoint. Although age 2 EF significantly predicted age 3 vocabulary size, this association was no longer significant after accounting for maternal education status. Our results illustrate that vocabulary size plays an important role in predicting children's later EF performance across various timepoints in early childhood, even after controlling for children's initial EF scores. These findings have important implications for intervention research as fostering early vocabulary acquisition may serve as a possible avenue for improving EF outcomes in young children.

Research Highlights

• Children's vocabulary size is positively correlated with their concurrent executive functioning skill at ages 2, 3, 4, and 6
• Young children's early vocabulary scores predict their later EF performance across measurement waves, even after controlling for initial EF skill
• There is stability in children's relative vocabulary size and executive functioning performance over time in early childhood

     

Expository Texts in First-Grade Classroom Libraries: Issues in Teacher Selection

Abstract

In 2010, the Common Core State Standards (CCSS) were adopted by most states in the US. The authors of these standards called for a shift from previous standards by recommending that young children experience a 50-50 balance between informational and literary reading. For this mixed-methods study, researchers examined the contents of 23 first-grade classroom libraries 8?years after the implementation of the CCSS to determine the percentage of expository texts found in these libraries and if these percentages differed based on the SES of the school or the number of years a teacher had been teaching. In addition, researchers interviewed twelve selected classroom teachers to gain an understanding of how they selected books for their libraries and what influenced their decisions. Results indicated that 22.8% of the texts found in first-grade classroom libraries were expository and there was no difference based on SES of the school or years a teacher had been in the classroom. Teacher interviews indicated that book cost, reading level, student interest, and genre (both narrative and expository/nonfiction) influenced their library text selections. Only two teachers indicated that the CCSS impacted their book choices.