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In light of Musolino, Chunyo, and Landau's recent findings and conclusions regarding syntax comprehension in Williams Syndrome (this issue), we first review the criteria used to determine whether the development of language is typical or atypical and, second, consider our current understanding of the causes of language delay. Given a certain set of theoretical assumptions (e.g., generative/modular), fairly poor performance can nevertheless be viewed as indicating typical development. Given other theoretical assumptions (e.g., a neuroconstructivist view of constrained development), the same data can be viewed as indicative of atypicality. © Taylor & Francis Group, LLC.

Original publication




Journal article


Language Learning and Development

Publication Date





162 - 169