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Behavior-Genetic and Molecular Studies of Disorders of Speech and Language: An Overview

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As of September 2, 2007 when this chapter was written, there were an estimated 994,638 words in the English language (http://www.languagemonitor.com/). Everyone agrees that we are not born with the knowledge of these words and the rules by which they are strung together. A newborn child does not know or use any words. However, a child entering school has a lexicon of ~ 13,000 words which, by the end of schooling, expands to ~ 60,000 words and during adulthood reaches ~ 120,000 words (Pinker 1999).

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Grigorenko, E.L. (2009). Behavior-Genetic and Molecular Studies of Disorders of Speech and Language: An Overview. In: Kim, YK. (eds) Handbook of Behavior Genetics. Springer, New York, NY. https://doi.org/10.1007/978-0-387-76727-7_9

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