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In this video I provide an overview of language development in children. Children learn thousands of words within a matter of a few years and they seem to effortlessly pick up and apply the rules of grammar, first in their telegraphic speech and later in more complex sentences. Errors of overgeneralization reveal that by age 4 or 5 children already have an understanding of grammatical rules and are able to apply these rules to new words, which can also be demonsrated in the Wug Test. There is a critical period for language development and children who are deprived of language and do not have sufficient exposure before age 7 may be unable to ever fully develop linguistic fluency.

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The Wug Test demonstration with Steven Pinker:
https://www.youtube.com/watch?v=DYJTdYGckBs