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In this chapter, we consider trajectories of change in vernacular African American Language (AAL) based on a set of seven temporal data points, from 48 months of age to post-secondary (19-21 years of age), using a Dialect Density Measure (DDM). Although different trajectories are uncovered, the predominant pattern is the “roller-coaster effect,” in which children’s vernacular index entering school recedes over the first four grades, accelerates during sixth to eighth grade, then recedes again as they proceed through secondary and post-secondary school. Comparison of token-based and type-based inventories show a high correlation in the results, and most individual variables also follow this pattern. However, some variables that are acquired during the later acquisition phase, such as ‘habitual be’ and copula/auxiliary absence, may show divergent patterns over the early lifespan.
From birth to early adulthood, all aspects of a child's life undergo enormous development and change, and language is no exception. This book documents the results of a pioneering longitudinal linguistic survey, which followed a cohort of sixty-seven African American children over the first twenty years of life, to examine language development through childhood. It offers the first opportunity to hear what it sounds like to grow up linguistically for a cohort of African American speakers, and provides fascinating insights into key linguistics issues, such as how physical growth influences pronunciation, how social factors influence language change, and the extent to which individuals modify their language use over time. By providing a lens into some of the most foundational questions about coming of age in African American Language, this study has implications for a wide range of disciplines, from speech pathology and education, to research on language acquisition and sociolinguistics.
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