Feburary 11, 2010: Anne Fernald

Early experience with language really matters: Links between maternal talk, processing efficiency, and vocabulary growth among diverse children.


Research on the early development of cognition and language has focused primarily on infants from middle-class families, excluding less advantaged children. But we know that SES differences are strongly associated with the quantity and quality of early cognitive stimulation available to infants. Longitudinal research on the development of fluency in language reveals relations between processing speed in infancy and longterm outcomes for both high-SES English-learning children and low-SES Spanish-learning children. But by 18 months, we find that low-SES children are already substantially slower in processing speed as well as vocabulary growth. It turns out that differences in early experience with language contribute to variability observed in children's efficiency in real-time processing. Within low-SES families, those children whose mothers talked with them more learned vocabulary more quickly; they also made more rapid gains in processing speed. By examining variability both within and between groups of children who differ in early experience with language, we gain insight into common developmental trajectories of lexical growth in relation to greater processing efficiency, and discover environmental factors that enable some children to progress more rapidly than others.